Difference between revisions of "Facet Based Resource Model"

Revision as of 07:17, 10 October 2016 (view source) Luca.frosini (Talk | contribs) (→‎isRelatedTo) ← Older edit		Revision as of 07:18, 10 October 2016 (view source) Luca.frosini (Talk | contribs) (→‎Resource) Newer edit →
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	| colspan=4 | '''Scope:''' Any entity (human or machine) playing an active role.		| colspan=4 | '''Scope:''' Any entity (human or machine) playing an active role.

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Revision as of 07:18, 10 October 2016

Contents 1 Basic Concepts 1.1 Property 1.1.1 Property Type 1.1.1.1 Basic Property Type 1.1.1.2 Derived Property Type 1.2 Header 1.3 Resources and (isRelatedTo) Relations 2 Facets 2.1 Facet 2.1.1 Access Point Facet 2.1.2 Capability Facet 2.1.3 Contact Facet 2.1.4 Contact Reference Facet 2.1.5 Coverage Facet 2.1.6 CPU Facet 2.1.7 Descriptive Metadata Facet 2.1.8 Event Facet 2.1.9 Identifier Facet 2.1.10 License Facet 2.1.11 Location Facet 2.1.12 Memory Facet 2.1.13 Networking Facet 2.1.14 Provenance Facet 2.1.15 Schema Facet 2.1.15.1 JSON Schema Facet 2.1.15.2 XSD Schema Facet 2.1.16 Simple Property Facet 2.1.17 Software Facet 2.1.18 State Facet 2.1.18.1 Container State Facet 2.1.18.2 Service State Facet 2.1.19 Subject Facet 3 Relations 3.1 Relation Property 3.2 isRelatedTo 3.2.1 belongsTo 3.2.2 callsFor 3.2.3 demands 3.2.4 dependsOn 3.2.5 discovers 3.2.6 hosts 3.2.7 involves 3.2.8 isActivatedBy 3.2.9 isCompliantWith 3.2.10 isConfiguredBy 3.2.11 isCorrelatedTo 3.2.11.1 isPartOf 3.2.12 isCustomizedBy 3.2.13 isDerivationOf 3.2.14 isManagedBy 3.2.15 isOwnedBy 3.2.16 isPluginOf 3.2.17 isPoweredBy 3.2.18 manages 3.2.19 requires 3.2.20 runs 3.2.21 runsPlugin 3.2.22 uses 3.3 consistsOf 3.3.1 isIdentifiedBy 3.3.2 hasCapability 3.3.3 hasContact 3.3.3.1 hasContributor 3.3.3.2 hasCreator 3.3.3.3 hasCurator 3.3.3.4 hasDeveloper 3.3.3.5 hasMaintainer 3.3.3.6 hasManager 3.3.3.7 hasOwner 3.3.4 hasCoverage 3.3.4.1 hasSpatialCoverage 3.3.4.2 hasTemporalCoverage 3.3.5 hasMemory 3.3.5.1 hasPersistentMemory 3.3.5.2 hasVolatileMemory 4 Resources 4.1 Resource 4.1.1 Actor 4.1.1.1 Legal Body 4.1.1.2 Person 4.1.2 Configuration Template 4.1.2.1 Configuration 4.1.3 Dataset 4.1.3.1 Concrete Dataset 4.1.4 Schema 4.1.5 Service 4.1.5.1 E-Service 4.1.5.1.1 Running Plugin 4.1.5.2 Hosting Node 4.1.5.3 Virtual Service 4.1.6 Site 4.1.7 Software 4.1.8 Plugin 5 Best practices and guidelines 6 Suggested Extensions 6.1 Functionality Related Facet 7 Internal Entity and Relation 7.1 Context 7.2 isParentOf

Basic Concepts

• Two typologies of entities are envisaged:
  • Resources, i.e. entities representing a description of "thing" to be managed;
    • Every Resource is characterised by a number of Facets.
  • Facets, i.e. entities contributing to "build" a description of a Resource. Every facet, once attached to a Resource profile captures a certain aspect / characterization of the resource;
    • Every facet is characterised by a number of properties;

• Two typologies of relations are envisaged:
  • isRelatedTo, i.e. a relation linking any two Resources.
  • consistsOf, i.e. a relation connecting each Resource with one of the Facets characterizing it;

• Each entity and relation
  • has an header automatically generated for the sake of identification and provenance of the specific information;
  • can be specialized
    • A number of specializations are identified below. Such specializations are managed by the gCube Core services, i.e. Core services builds upon these specialization to realize its management tasks;
    • Other specializations can be defined by clients, the system make it possible to store these additional typologies of relations and facets and to discover them.

• On relations:
  • Any relation has a direction, i.e. a "source" (out bound of the relation) and a "target" (in bound of the relation). Anyway the relation can be also navigated in the opposite direction;
  • It is not permitted to define a Relation having a Facet as "source". In other words:
    • It is not permitted to define a Relation connecting a Facet with another one;
    • It is not permitted to define a Relation connecting a Facet with a Resource (as target);
  • A Facet instance can be linked (by consistsOf or any specialization of it) from different Resources.

Property

Any Property can be enriched with the following attributes:

• Name : Property Name
• Type : The Type of the Property (e.g. String, Integer, ...). See Property Type
• Description : The description of the Property. default=null.
• Mandatory (M): Indicate if the Property is mandatory. default=false.
• ReadOnly (RO): The Property cannot change its value. default=false.
• NotNull (NN): Whether the property must assume a value diverse from 'null' or not. default=false
• Max (Max): default=null
• Min (Min): default=null
• Regexpr (Reg)): A Regular Expression to validate the property value.default=null. A goog online tool for regex is avalable at https://regex101.com/

Property Type

Basic Property Type

Type	Java type	Description
Boolean	java.lang.Boolean or boolean	Handles only the values True or False
Integer	java.lang.Integer or int or java.math.BigInteger	32-bit signed Integers
Short	java.lang.Short or short	Small 16-bit signed integers
Long	java.lang.Long or long	Big 64-bit signed integers
Float	java.lang.Float or float	Decimal numbers
Double	java.lang.Double or double	Decimal numbers with high precision
Date	java.util.Date	Any date with the precision up to milliseconds.
String	java.lang.String	Any string as alphanumeric sequence of chars
Embedded	? extends org.gcube.informationsystem.model.embedded.Embedded	This is an Object contained inside the owner Entity and has no Header. It is reachable only by navigating the owner Entity.
Embedded list	List<? extends org.gcube.informationsystem.model.embedded.Embedded>	List of Objects contained inside the owner Entity and have no Header. They are reachable only by navigating the owner Entity.
Embedded set	Set<? extends org.gcube.informationsystem.model.embedded.Embedded>	Set (no duplicates) of Objects contained inside the owner Entity and have no Header. They are reachable only by navigating the owner Entity.
Embedded map	Map<String, ? extends org.gcube.informationsystem.model.embedded.Embedded>	Map of Objects contained inside the owner Entity and have no Header. They are reachable only by navigating the owner Entity.
Byte	java.lang.Byte or byte	Single byte. usesful to store small 8-bit signed integers
Binary	java.lang.Byte[] or byte[]	Can contain any value as byte array

Derived Property Type

The following are obtained using a String as real type and adding a validation regex.

Type	Java type	Description
Enum	java.lang.Enum or enum	by default it is represented using the String representation of the Enum. So that the primitive type used will be String. The enumeration is checked by setting Regexpr property. The Regular Expression is auto-generated and it will be something like ^(FIRST-ENUM-STRING_REPRESENTATION|SECOND-ENUM-STRING_REPRESENTATION|...|LAST_ENUM_STRING_REPRESENTATION)$. Otherwise (if indicated using an annotation), it can be represented using the Integer value of the Enum. So that the primitive type used will be Integer. The enumeration is checked using Max and Min properties.
UUID	java.util.UUID	String representation of the UUID. The check is obtained using the regular expression ^([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}){1}$
URL	java.net.URL	String representation of the URL. No check actually.
URI	java.net.URI	String representation of the URI. No check actually.

Header

Every Entity and Relation has an Header automatically filled by the System. The Header has the following properties:

Name	Type	Attributes	Description
uuid	UUID	Mandatory=true NotNull=true ReadOnly=true	This uuid can be used to univocally identify the Entity or the Relation
creator	String	Mandatory=true NotNull=true ReadOnly=true	Filled at creation time. The creator is retrieved using the authorization token
creationTime	Date	Mandatory=true NotNull=true ReadOnly=true	Creation time in milliseconds. Represent the difference, measured in milliseconds, between the creation time and midnight, January 1, 1970 UTC
lastUpdateTime	Date	Mandatory=true NotNull=true	Last Update time in milliseconds. Represent the difference, measured in milliseconds, between the last update time and midnight, January 1, 1970 UTC

Resources and (isRelatedTo) Relations

Facets

Early ideas and thinking on facets were documented at 2nd Generation Resource Model : Facets

Facet

Facets are collections of attributes conceived to capture a certain feature / aspect of the Resource they are associated with.

Every Facet has:

• An Header automatically generated to capture identification- and provenace-related aspects of the facet once it is instantiated;
• Zero or more properties. Besides the per-facet envisaged properties, clients can add new ones.

Access Point Facet

Access Point Facet extends Facet

Goal: This facet captures information on an “access point” of a resource, i.e. any web-based endpoint to programmatically interact with the resource via a known protocol.
Properties
Name	Type	Attributes	Description
entryName	String		A distinguishing string to be used by clients to identify the access point of interest;
endpoint	URI	Mandatory=true ReadOnly=true NotNull=true	The URI which characterizes the specific endpoint instance;
protocol	String		The high-level protocol used by the access point. The String could contains the version if needed. E.g. WMS not http which is already contained in URI.
description	String		A human oriented text accompanying the access point.
authorization	String		Contains authorization information. E.g: a token, username:password. By relying on schema it should be sufficient to capture also whether the content is encrypted or not
authorizationSchema	URI		URI of the Schema to be used for a proper interpretation of the authorization value.
properties	String		This can be an arbitrarily complex element whose "structure" is defined by the associated schema
propertiesSchema	URI		URI of the Schema to be used for a proper interpretation of the properties value.
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	consistsOf	0..n	Access Point Facet	Each access point captures a possible web-based method for accessing the dataset. Any embargo-related information can be captured by the access policy property of the consistsOf.
Concrete Dataset	consistsOf	1..n	Access Point Facet	Each access point captures a possible web-based method for accessing the dataset. Any embargo-related information can be captured by the access policy property of the consistsOf.
E-Service	consistsOf	1..n	Access Point Facet	Each access point captures a possible web-based method for accessing the service.
Software	consistsOf	1..n	Access Point Facet	Each access point captures a possible web-based method for accessing a software manifestation. Examples are links to maven artifact on nexus, javadoc, wiki, svn, etc.

Capability Facet

Capability Facet extends Facet

Goal: This facet captures a defined facility for performing a specified task supported by a given Service or Software;
Properties
Name	Type	Attributes	Description
name	String	Mandatory=true ReadOnly=true NotNull=true	The distinguishing name of the capability.
description	String		A human oriented description of the capability;
qualifier	String		A string used to specialize the capability;
Known Usage
Source	Relation	Multiplicity	Target	Description
Service	hasCapability	0..n	Capability Facet	To capture one of the facilities supported by the Service;
Software	hasCapability	0..n	Capability Facet	To capture one of the facilities supported by the Software;

Contact Facet

Contact Facet extends Facet

Goal: This facet captures information on a point of contact for the resource, i.e. a person or a department serving as the coordinator or focal point of information concerning the resource. As you can see in the known usages part, there are diverse points of contact that can be associated to a given resource and the role of the association is captured by using a specific relation.
Properties
Name	Type	Attributes	Description
title	String	Mandatory=false	A name describing the profession or marital status of the point of contact. E.g. Dr, Mrs, Mr.
name	String	Mandatory=true NotNull=true	First Name
middleName	String	Mandatory=false	Middle Name
surname	String	Mandatory=true NotNull=true	Surname
eMail	String	Mandatory=true NotNull=true Regex=^[a-z0-9._%+-]{1,128}@[a-z0-9.-]{1,128}	A restricted range of RFC‑822 compliant email address. Please note that just domain based email address are accepted (not IP based). Please also note that new TLD are also accepted (e.g luca@google without .com which is a valid email address). You can test here the provided regular expression with your input email address https://regex101.com/ before open a ticket.
Known Usage
Source	Relation	Multiplicity	Target	Description
Actor	isIdentifiedBy	1..n	Contact Facet	An Actor must have at least a primary point of contact which will be used for identification purposes.
Actor	hasContact	0..n	Contact Facet	An Actor can have an arbitrary number of points of contact which provide secondary contact information.
Legal Body	isIdentifiedBy	1..n	Contact Facet	A Legal Body must have at least a point of contact which permit to identify the Legal Body per se.
Person	isIdentifiedBy	1..n	Contact Facet	A Person must have at least a point of contact which permit to identify the Person per se.
Dataset	hasContact	1..n	Contact Facet	A Dataset must have at least a point of contact to be used to acquire information on it.
Dataset	hasContributor	0..n	Contact Facet	One of the dataset contributors;
Dataset	hasCreator	0..n	Contact Facet	One of the dataset creators;
Dataset	hasCurator	0..n	Contact Facet	One of the dataset curators;
Dataset	hasMaintainer	0..n	Contact Facet	One of the dataset maintainers;
Dataset	hasOwner	0..n	Contact Facet	One of the dataset owners;
Concrete Dataset	hasMaintainer	1..n	Contact Facet
Schema	hasContact	1..n	Contact Facet
Site	hasContact	1..n	Contact Facet
Site	hasMaintainer	1..n	Contact Facet
Site	hasManager	1..n	Contact Facet

Contact Reference Facet

Contact Reference Facet extends Facet

Goal: This facet captures information on the primary and authoritative contact for the resource it is associated with.
Properties
Name	Type	Attributes	Description
website	URL		The main website
address	String		A physical address
phone	String		A phone number
Known Usage
Source	Relation	Multiplicity	Target	Description
Actor	consistsOf	0..n	Contact Reference Facet	The primary contact information for the Actor it is attached to;
Legal Body	consistsOf	0..n	Contact Reference Facet	The primary contact information for the Legal Body it is attached to;
Person	consistsOf	0..n	Contact Reference Facet	The primary contact information for the Person it is attached to;

Coverage Facet

Coverage Facet extends Facet

Goal: This facet captures information on the extent of the Resource, i.e. any aspect aiming at capturing an indicator of the amount/area the resource covers be it a geospatial area, a temporal area, or any other "area".
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true	The amount indicating the "area" covered by the dataset according to the reference schema;
schema	URI	Mandatory=true NotNull=true	The reference schema to be used to interpret the value;
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	hasCoverage	1..n	Coverage Facet
Dataset	hasTemporalCoverage	0..n	Coverage Facet	any temporal coverage characterising the dataset content;
Dataset	hasSpatialCoverage	0..n	Coverage Facet	any spatial coverage characterising the dataset content;

CPU Facet

CPU Facet extends Facet

Goal: This facet captures information on the Central Processing Unit of the resource it is associated.
Properties
Name	Type	Attributes	Description
model	String	Mandatory=true NotNull=true	CPU Model
vendor	String	Mandatory=true NotNull=true	CPU Vendor
clockSpeed	String	Mandatory=true NotNull=true	Clock Speed with the unit
Known Usage
Source	Relation	Multiplicity	Target	Description
Hosting Node	consistsOf	1..n	CPU Facet:

Descriptive Metadata Facet

Descriptive Metadata Facet extends Facet

Goal: This facet captures information on descriptive metadata to be associated with teh resource
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true	A metadata record representing the descriptive metadata and encoded according to the reference schema;
schema	URI	Mandatory=true NotNull=true	The reference schema to be used to interpret the value attribute;
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	consistsOf	0..n	Descriptive Metadata Facet
Schema	consistsOf	0..n	Descriptive Metadata Facet

Event Facet

Event Facet extends Facet

Goal: This facet captures information on a certain event / happening characterising the life cycle of the resource.
Properties
Name	Type	Attributes	Description
date	Calendar	Mandatory=true NotNull=true	The time the event took place / occurred;
value	String	Mandatory=true NotNull=true	The typology of event according to the reference schema;
schema	URI		The reference schema to be used to interpret the value describing the event;
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	consistsOf	0..n	Event Facet
E-Service	consistsOf	1..n	Event Facet	E.g. ActivationTime, DeploymentTime
Hosting Node	consistsOf	1..n	Event Facet

Identifier Facet

Identifier Facet extends Facet

Goal: This facet captures information on Identifiers (other than the ones automatically generated by the system) that can be attached to a resource.
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true	The identifier. E.g. http://fr.dbpedia.org/resource/Thunnus de305d54-75b4-431b-adb2-eb6b9e546014
type	Enumeration	Mandatory=true NotNull=true	The typology of identifier. I.e. URI, DOI, IRI, URL, URN, UUID;
isPersistent	boolean	Mandatory=true NotNull=true	To indicate whether the Identifier is persistent or not.
Known Usage
Source	Relation	Multiplicity	Target	Description
Configuration Template	isIdentifiedBy	1..n	Identifier Facet
Configuration	isIdentifiedBy	1..n	Identifier Facet
Dataset	isIdentifiedBy	1..n	Identifier Facet
Concrete Dataset	isIdentifiedBy	1..n	Identifier Facet
Site	isIdentifiedBy	1..n	Identifier Facet

License Facet

License Facet extends Facet

Goal: This facet captures information on any license associated with the resource to capture the policies governing its exploitation and use.
Properties
Name	Type	Attributes	Description
name	String	Mandatory=true NotNull=true	The common name of the license. E.g. EUPL 1.1, GPLv2, BSD;
textURL	URL	Mandatory=true NotNull=true	The URL to the actual text of the license.
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	consistsOf	0..n	License Facet	The duration of license - if any - can be captured by the expiry date defined in the consistsOf relation.
E-Service	consistsOf	0..n	License Facet
Software	consistsOf	1..n	License Facet

Location Facet

The goal of this facet is to collect information about Location

Location Facet extends Facet

Goal: This facet captures information on a physical area characterising the resource it is associated with. This should not be confused with Coverage Facet.
Properties
Name	Type	Attributes	Description
country	String		The English name of the country. See http://data.okfn.org/data/core/country-list
location	String		The City name.
latitude	String		Latitude
longitude	String		Longitude
Known Usage
Source	Relation	Multiplicity	Target	Description
Site	consistsOf	1..n	Location Facet	the base where the site is operated;

Memory Facet

Memory Facet extends Facet

Goal: This facet captures information on computer memory equipping the resource and its usage.
Properties
Name	Type	Attributes	Description
size	Long	Mandatory=true NotNull=true	Total amount of memory.
used	Long	Mandatory=true NotNull=true	Used amount of memory.
unit	Enum	Mandatory=true NotNull=true	The unit of measure used to report size and used attributes. Allowed values are Byte, kB (kilobyte 10^3), MB (megabyte 10^6), GB (gigabyte 10^9), TB (terabyte 10^12), PB (petabyte 10^15), EB (exabyte 10^18), ZB (zettabyte 10^21), YB (yottabyte 10^24)
Known Usage
Source	Relation	Multiplicity	Target	Description
Hosting Node	hasPersistentMemory	1..n	Memory Facet	The Disk Space allocated to the hosting node;
Hosting Node	hasVolatileMemory	1..n	Memory Facet	The RAM allocated to the hosting node;

Networking Facet

Networking Facet extends Facet

Goal: This facet captures information on any (computer) network interface/access point associated with the resource.
Properties
Name	Type	Attributes	Description
hostName	String		Host Name
domainName	String		Domain Name
IPAddress	String	Mandatory=true NotNull=true Regex='/^(?>(?>([a-f0-9]{1,4})(?>:(?1)){7}|(?!(?:.*[a-f0-9](?>:|$)){8,})((?1)(?>:(?1)){0,6})?::(?2)?)|(?>(?>(?1)(?>:(?1)){5}:|(?!(?:.*[a-f0-9]:){6,})(?3)?::(?>((?1)(?>:(?1)){0,4}):)?)?(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?4)){3}))$/iD'	IP Address. Validation regular expression ca be foun at http://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses#answer-1934546 (Michael Rushton solution)
mask	String		Network Mask
broadcastAddress	String		Broadcast Address
Known Usage
Source	Relation	Multiplicity	Target	Description
Hosting Node	isIdentifiedBy	1..n	Networking Facet
Site	consistsOf	1..n	Networking Facet

Provenance Facet

Provenance Facet extends Facet

Goal: This facet captures information on provenance/lineage of the entire resource.
Properties
Name	Type	Attributes	Description
relationship	Enum		I.e. wasDerivedFrom, wasGeneratedBy
reference	String		resourceID (a reference to the "originator" Resource associated to the resource the facet is attached to by the relationship)
document	String		Provenance Document E.g. the xml format
documentSchema	URI		Document Schema E.g. a reference to the format
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	consistsOf	0..n	Provenance Facet

Schema Facet

Abstract Schema Facet extends Facet

Goal: This facet captures information on any schema associated with a reosurce.
Properties
Name	Type	Attributes	Description
name	String	Mandatory=true NotNull=true	Schema Name
description	String	Mandatory=true NotNull=true	Schema Description
schemaURL	URL		Schema definition URL (recommended)
Known Usage
Source	Relation	Multiplicity	Target	Description
Schema	isIdentifiedBy	1..n	Schema Facet

JSON Schema Facet

Even is still under standardization (seems stalled) IETF is promoting a de-facto standard for JSON http://json-schema.org/. https://tools.ietf.org/html/draft-zyp-json-schema-04 https://tools.ietf.org/html/draft-fge-json-schema-validation-00 https://tools.ietf.org/html/draft-luff-json-hyper-schema-00

JSON Schema Facet extends Schema Facet

Goal: This facet captures information on a JSON schema associated with a resource.
Properties
Name	Type	Attributes	Description
content	Embedded	Mandatory=true NotNull=true	JSON schema definition
Known Usage
Source	Relation	Multiplicity	Target	Description
Schema	isIdentifiedBy	0..n	JSON Schema Facet

XSD Schema Facet

XSD Schema Facet extends Schema Facet

Goal: This facet captures information on any XML Schema Definition (XSD) associated with the resource.
Properties
Name	Type	Attributes	Description
content	String	Mandatory=true NotNull=true	XSD Schema Definition
Known Usage
Source	Relation	Multiplicity	Target	Description
Schema	isIdentifiedBy	0..n	XSD Schema Facet

Simple Property Facet

Simple Property Facet extends Facet

Goal: This facet captures information on any property by a simple name-value pair.
Properties
Name	Type	Attributes	Description
name	String	Mandatory=true NotNull=true	Name
value	String	Mandatory=true NotNull=true	Value
Known Usage
Source	Relation	Multiplicity	Target	Description
Configuration Template	consistsOf	1..n	Simple Property Facet
Hosting Node	consistsOf	0..n	Simple Property Facet	Environment Variables]

Software Facet

Software Facet extends Facet

Goal: This facet captures information on any software associated with the resource.
Properties
Name	Type	Attributes	Description
name	String	Mandatory=true NotNull=true	The name of the software artefact being described. E.g. artifactId in maven, Service Name in gCube software, the software name for retail software Microsoft Office 2013-SP2.
group	String	Mandatory=true NotNull=true	The name of "group" the software artefact belongs to. E.g. groupId in Maven, ServiceClass in gCube software, company name for retail software Microsoft Office 2013-SP2.
version	String	Mandatory=true NotNull=true	The particular release of the software artefact. E.g. maven version, Service Version in gCube software, artifactId in maven, the software version for retail software Microsoft Office 2013-SP2.
description	String		A human oriented description of the software artefact being described.
qualifier	String		E.g. packaging or scope in maven, scope level or sharable level in gCube software, target architecture for retail software x86 or amd64.
optional	Boolean		E.g. used to indicate an optional dependency both in maven as far as in gCube.
Known Usage
Source	Relation	Multiplicity	Target	Description
E-Service	isIdentifiedBy	1..n	Software Facet	The software enabling the E-Service capabilities
E-Service	consistsOf	0..n	Software Facet	Software available in the E-Service environment that characterizes the specific E-Service instance.
Running Plugin	isIdentifiedBy 1..1 Software Facet	The software enabling the Running Plugin
Hosting Node	consistsOf	0..n	Software Facet	E.g. to report the hosted software that are not registered in the Resource Registry as Software Resource, e.g. Operating System.
Virtual Service	isIdentifiedBy	1..n	Software Facet
Software	isIdentifiedBy	1..n	Software Facet	Software coordinates which identify the Software per se.
Software	consistsOf	1..n	Software Facet	Any other software apart from the one connected with isIdentifiedBy relation (gCube coordinates).
Plugin	isIdentifiedBy	1..n	Software Facet	Software coordinates which identify the Plugin per se.

State Facet

The goal of this facet is to ...

Abstract State Facet extends Facet

Goal: This facet captures information on state to be associated with the resource. State is captured by any controlled vocabulary which is an integral part of the facet.
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true	The value of the state expressed according to the schema below;
schema	URI	Mandatory=true NotNull=true	The schema that have been used to assign the state value and that must be used to properly interpret it;
Known Usage
Source	Relation	Multiplicity	Target	Description
Software	consistsOf	1..n	State Facet	E.g. Deprecated, Active, Obsolete

Container State Facet

Container State Facet extends Facet

Goal: This facet captures information on the operational status of the container, i.e. the
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true Regex=(started|ready|certified|down|failed)	The value of the state
Known Usage
Source	Relation	Multiplicity	Target	Description
Hosting Node	consistsOf	1..1	Container State Facet	An Hosting node can be started, ready, certified, down, failed.

Service State Facet

Service State Facet extends Facet

Goal: This facet captures information on the operational state of the service it is associated with.
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true Regex=(STARTED|ready|down|failed)	The value of the state
Known Usage
Source	Relation	Multiplicity	Target	Description
E-Service	consistsOf	1..1	Service State Facet	An E-Service can be STARTED, ready, down, failed.

Subject Facet

Subject Facet extends Facet

Goal: This facet captures information on subjects associated with the resource for description, classification and discovery purposes;
Properties
Name	Type	Attributes	Description
value	String	Mandatory=true NotNull=true	The value of the subject. Must be compliant with schema.
schema	URI	Mandatory=true NotNull=true	The URI of the schema subject value comes from. It is only an informative field. It is not used for validation from IS part.
Known Usage
Source	Relation	Multiplicity	Target	Description
Dataset	consistsOf	0..n	Subject Facet
Schema	consistsOf	0..n	Subject Facet

Relations

Every relation has:

• An Header
• A Relation Property
• Zero or More properties (not necessarily predefined, similarly to Facets).

Relation Property

Name	Type	Description
referentialIntegrity	Enum	I.e. onDeleteCascadeWhenOrphan, onDeleteCascade, onDeleteKeep. The meaning is related to the relation direction.
accessPolicy	Embedded (i.e. AccessPolicy)	A policy is characterized by a name, a description, and the period ([start], [end]) when the policies apply
expiryTime	Long	The expiry date can be used to model the time until the relationship is valid, Expiry time in milliseconds. Represent the difference, measured in milliseconds, between the creation time and midnight, January 1, 1970 UTC

isRelatedTo

isRelatedTo

Source	Relation	Multiplicity	Target	Description
Resource	isRelatedTo	0..n	Resource	A relation linking any two Resources.

belongsTo

belongsTo extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Person	belongsTo	0..n	Legal Body	...

callsFor

callsFor extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Service	callsFor	0..n	Service

demands

demands extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Virtual Service	demands	0..n	Software

dependsOn

dependsOn extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Software	dependsOn	0..n	Software

discovers

discovers extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
E-Service	discovers	0..n	E-Service

hosts

hosts extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Hosting Node	hosts	0..n	E-Service

involves

involves extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Dataset	involves	0..n	Actor

isActivatedBy

isActivatedBy extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Running Plugin	isActivatedBy	1..1	E-Service

isCompliantWith

isCompliantWith extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Dataset	isCompliantWith	0..n	Schema

isConfiguredBy

isConfiguredBy extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Software	isConfiguredBy	0..n	Configuration Template

isCorrelatedTo

isCorrelatedTo extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Dataset	isCorrelatedTo	0..n	Dataset

isPartOf

isPartOf extends isCorrelatedTo

Source	Relation	Multiplicity	Target	Description
Concrete Dataset	isPartOf	0..n	Dataset

isCustomizedBy

isCustomizedBy extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Service	isCustomizedBy	0..n	Configuration

isDerivationOf

isDerivationOf extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Configuration	isDerivationOf	1..1	Configuration Template

isManagedBy

isManagedBy extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Hosting Node	isManagedBy	0..n	Site

isOwnedBy

isOwnedBy extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Site	isOwnedBy	0..n	Actor

isPluginOf

isPluginOf extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Plugin	isPluginOf	1..n	Software

isPoweredBy

isPoweredBy extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Hosting Node	isPoweredBy	0..n	Software

manages

manages extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Service	manages	0..n	Dataset

requires

requires extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
Software	requires	0..n	Service

runs

runs extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
E-Service	runs	0..n	Software

runsPlugin

runsPlugin extends runs

Source	Relation	Multiplicity	Target	Description
Running Plugin	runsPlugin	1..1	Plugin

uses

uses extends isRelatedTo

Source	Relation	Multiplicity	Target	Description
E-Service	uses	0..n	E-Service

consistsOf

isIdentifiedBy

Source	Relation	Multiplicity	Target	Description
Resource	consistsOf	1..n	Facet

isIdentifiedBy

isIdentifiedBy extends consistsOf

Source	Relation	Multiplicity	Target	Description
Definition
Resource	isIdentifiedBy	1..n	Facet
Known Usage
Actor	isIdentifiedBy	1..n	Contact Facet
Legal Body	isIdentifiedBy	1..n	Contact Facet
Person	isIdentifiedBy	1..n	Contact Facet
Configuration Template	isIdentifiedBy	1..n	Identifier Facet
Configuration	isIdentifiedBy	1..n	Identifier Facet
Dataset	isIdentifiedBy	1..n	Identifier Facet
Concrete Dataset	isIdentifiedBy	1..n	Identifier Facet
Service	isIdentifiedBy	1..n	Facet
Virtual Service	isIdentifiedBy	1..n	Software Facet	...
E-Service	isIdentifiedBy	1..1	Software Facet	...
Schema	isIdentifiedBy	1..n	Identifier Facet	...
Site	isIdentifiedBy	1..n	Identifier Facet	...
Software	isIdentifiedBy	1..n	Software Facet	Software coordinates which identify the Software per se.
Plugin	isIdentifiedBy	1..n	Software Facet	Software coordinates which identify the Plugin per se.

hasCapability

Abstract hasCapability extends consistsOf

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasCapability	0..n	Capability Facet
Known Usage
Service	hasCapability	0..n	Capability Facet
Software	hasCapability	0..n	Capability Facet

hasContact

Abstract hasContact extends consistsOf

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasContact	0..n	Contact Facet
Known Usage
Dataset	hasContact	1..n	Contact Facet	...

hasContributor

hasContributor extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasContributor	0..n	Contact Facet
Known Usage
Dataset	hasContributor	0..n	Contact Facet	Is he the contributor

hasCreator

hasCreator extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasCreator	0..n	Contact Facet
Known Usage
Dataset	hasCreator	0..n	Contact Facet	Is he the creator

hasCurator

hasCurator extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasCurator	0..n	Contact Facet
Known Usage
Dataset	hasCurator	0..n	Contact Facet	Is he the curator

hasDeveloper

hasDeveloper extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasDeveloper	0..n	Contact Facet
Known Usage

hasMaintainer

hasMaintainer extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasMaintainer	0..n	Contact Facet
Known Usage
Dataset	hasMaintainer	0..n	Contact Facet	Is he the maintainer

hasManager

hasManager extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasManager	0..n	Contact Facet
Known Usage

hasOwner

hasOwner extends hasContact

Source	Relation	Multiplicity	Target	Description
Definition
Resource	hasOwner	0..n	Contact Facet
Known Usage
Dataset	hasOwner	0..n	Contact Facet	Is he the owner

hasCoverage

Abstract hasCoverage extends consistsOf

Source	Relation	Multiplicity	Target	Description
Definition
Resources	hasCoverage	0..n	Coverage Facet	...
Known Usage
Dataset	hasCoverage	1..n	Coverage Facet	...

hasSpatialCoverage

hasSpatialCoverage extends hasCoverage

Source	Relation	Multiplicity	Target	Description
Definition
Resources	hasSpatialCoverage	0..n	Coverage Facet	...
Known Usage
Dataset	hasSpatialCoverage	0..n	Coverage Facet	...

hasTemporalCoverage

hasTemporalCoverage extends hasCoverage

Source	Relation	Multiplicity	Target	Description
Definition
Resources	hasTemporalCoverage	0..n	Coverage Facet	...
Known Usage
Dataset	hasTemporalCoverage	0..n	Coverage Facet	...

hasMemory

Abstract hasMemory extends consistsOf

Source	Relation	Multiplicity	Target	Description
Definition
Resources	hasMemory	0..n	Memory Facet	...

hasPersistentMemory

hasPersistentMemory extends hasMemory

Source	Relation	Multiplicity	Target	Description
Definition
Resources	hasPersistentMemory	0..n	Memory Facet	...
Known Usage
Hosting Node	hasPersistentMemory	1..n	Memory Facet	Disk Space

hasVolatileMemory

hasVolatileMemory extends hasMemory

Source	Relation	Multiplicity	Target	Description
Definition
Resources	hasVolatileMemory	0..n	Memory Facet	...
Known Usage
Hosting Node	hasVolatileMemory	1..n	Memory Facet	RAM

Resources

Every Resource has:

• An Header
• One or more Facets characterizing it;
• Zero or More relation with other Resources

A class can be identified as Abstract. This means that cannot be instantiated. It is expected that one of its specializations are instantiated. It is not required that an Abstract class establishes an isIdentifiedBy relation with a Facet.

Resource

Abstract Resource Profile

Scope: This entity is conceived to describe every "main thing" to be registered and discovered by the Information System.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Facet	Any Resource has at least one Facet which in some way allow to identify the Resource per se.
consistsOf	0..n	Facet	Any Resource consist of zero or more Facets which describes the different aspects of the facet.
Relations
isRelatedTo	0..n	Resource	Any Resource can be related to any other resource.

Actor

Abstract Actor extends Resource

Scope: Any entity (human or machine) playing an active role.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Contact Facet	An Actor has at least a Contact Facet which permit to identify the Actor per se.
hasContact	0..n	Contact Facet	An Actor can have other Contact Facets which provide secondary contact information.
consistsOf	0..n	Contact Reference Facet
Relations
Dataset involves (0..n) Actor: ?
Site isOwnedBy (0..n) Actor: The

Legal Body

Legal Body extends Actor

Scope: A legal entity playing the role of an Actor.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Contact Facet	A Legal Body has at least a Contact Facet which permit to identify the Legal Body per se.
consistsOf	0..n	Contact Reference Facet
Relations
Person belongsTo (0..n) Legal Body

Person

Person extends Actor

Scope: Any human playing the role of Actor.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Contact Facet	A Person has at least a Contact Facet which permit to identify the Person per se.
consistsOf	0..n	Contact Reference Facet
Relations
Person belongsTo (0..n) Legal Body

Configuration Template

Configuration Profile

Scope: It represents a template for a configuration. It describe how a configuration has to be realized. E.g. Used to define the accounting configuration parameters template.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Identifier Facet	...
consistsOf	1..n	Simple Property Facet	...
Relations
Configuration isDerivationOf (1..1) Configuration Template
Software isConfiguredBy (0..n) Configuration Template

Configuration

Configuration Profile extends

Scope: An instance of a configuration template characterising the behaviour and shape of the resource it is attached to;
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Identifier Facet	...
Relations
Configuration isDerivationOf (1..1) Configuration Template
Service isCustomizedBy (0..n) Configuration

Dataset

Dataset Profile

Scope: Any set of digital objects representing data and treated collectively as a unit.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Identifier Facet	The set of Identifiers associated with the Dataset instance.
hasContact	1..n	Contact Facet	The contact information of the entity responsible for the dataset.
hasContributor	0..n	Contact Facet	The contact information on contributors supporting the creation and development of the Dataset.
hasCreator	0..n	Contact Facet	The contact information of the creator of the Dataset.
hasCurator	0..n	Contact Facet	The contact information of the entity responsible for the curation of the dataset;
hasMaintainer	0..n	Contact Facet	The contact information of the entity responsible for the maintenance of the dataset;
hasOwner	0..n	Contact Facet	The contact information of the entity having the ownership of the dataset;
consistsOf	0..n	Access Point Facet	The access point to use for having access to the dataset. The embargoState can be modeled through the access policy defined in the consistsOf relation.
consistsOf	0..n	License Facet	The licence governing dataset exploitation. The duration of license (if any) is captured by the expiry date defined in the consistsOf relation.
consistsOf	0..n	Event Facet	Any "event" characterising the lifecycle of the dataset, e.g. collection date, last collection date.
consistsOf	0..n	Provenance Facet	Any provenance record associated with the dataset;
hasCoverage	1..n	Coverage Facet	Any coverage related information (e.g. topic, species) characterising the content of the dataset.
hasTemporalCoverage	0..n	Coverage Facet	Any temporal coverage information characterising the content of the dataset, e.g. the time-span covered by the dataset;
hasSpatialCoverage	0..n	Coverage Facet	Any geo-spatial coverage information characterising the content of the dataset, e.g. the area covered by the dataset;
consistsOf	0..n	Descriptive Metadata Facet	Any descriptive information associated with the dataset, e.g. for discovery purposes.
consistsOf	0..n	Subject Facet	Any subject / tag associated with the dataset for descriptive and discovery purposes.
Relations
Dataset involves (0..n) Actor
Dataset isCorrelatedTo (0..n) Dataset
Dataset isCompliantWith (0..n) Schema: Any schema characterising the content of the dataset, e.g. the schema describing the 'columns' of a CSV-based dataset;
Concrete Dataset isPartOf (0..n) Dataset: The reference to the 'incarnations' / 'manifestations' contributing to a dataset;
Service manages (0..n) Dataset: The link between the service that 'manages' the dataset and the dataset, e.g. the service that hosts the dataset and give access to it;

Concrete Dataset

Concrete Dataset Profile extends Dataset Profile

Scope: Any incarnation / manifestation of a dataset or part of it;
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Identifier Facet	The set of Identifiers associated with the Concrete Dataset instance.
hasMaintainer	1..n	Contact Facet	The contact information of the entity responsible for the maintenance of the concrete dataset;
consistsOf	1..n	Access Point Facet	The access point to use for having access to the concrete dataset. The embargoState can be modeled through the access policy defined in the consistsOf relation
Relations
Concrete Dataset isPartOf (0..n) Dataset: The reference to the Dataset the instance manifests / contribute to manifest.

Schema

Schema Profile

Scope: Any reference schema to be used to specify values compliant with it. Examples include controlled vocabularies, ontologies,
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Schema Facet
isIdentifiedBy	0..n	JSON Schema Facet
isIdentifiedBy	0..n	XSD Schema Facet
hasContact	1..n	Contact Facet
consistsOf	0..n	Descriptive Metadata Facet
consistsOf	0..n	Subject Facet
Relations
Dataset isCompliantWith (0..n) Schema

Service

Abstract Service Profile

Scope: An abstract entity to represent any typology of Service worth registering in the infrastructure.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Facet
consistsOf	0..n	Descriptive Metadata Facet	Any descriptive information associated with the service, e.g. for discovery purposes.
consistsOf	0..n	Subject Facet	Any subject / tag associated with the service for descriptive, cataloguing and discovery purposes.
hasCapability	0..n	Capability Facet
Relations
Service callsFor 0..n Service:
Service isCustomizedBy 0..n Configuration:
Service manages 0..n Dataset:
Software requires 0..n Service:

E-Service

E-Service Profile extends Service Profile

Scope: Any working service that is registered in the infrastructure and made available by an Access Point.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Software Facet	The main software enabling the E-Service capabilities.
consistsOf	0..n	Software Facet	Software available in the E-Service environment that characterizes the specific E-Service instance.
consistsOf	1..n	Access Point Facet	Identify the endpoints of the E-Service
consistsOf	1..n	Event Facet	Events characterising the current status and lifecycle of the service, e.g. ActivationTime, DeploymentTime
consistsOf	1..1	Service State Facet	The current status of the E-Service, e.g. STARTED, ready, down, failed
consistsOf	0..n	License Facet	The specific terms of use governing the exploitation of the E-Service.
Relations
E-Service discovers (0..n) E-Service: A reference to any other E-Service, the E-Service instance is discovering through query on IS.
E-Service runs (0..n) Software: A reference to the Software the E-Service is running. TBD the relation between this and the facets above;
E-Service uses (0..n) E-Service: A reference to any other E-Service, the E-Service instance is invoking.
Hosting Node hosts (0..n) E-Service: A reference to the E-Services activated by a specific Hosting Node.
Running Plugin isActivatedBy (1..1) E-Service: A reference to the E-Service that is running the specific plugin instance.

Running Plugin

Running Plugin Profile extends E-Service Profile

Scope: Any instance of a Plugin deployed and running by an E-Service.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..1	Software Facet	The software enabling the Running Plugin
Relations
Running Plugin isActivatedBy (1..1) E-Service: A reference to the E-Service is running the plugin.
Running Plugin runsPlugin (0..n) Plugin

Hosting Node

Hosting Node Profile extends Service Profile

Scope: Any server\machine playing the role of "Hosting Node", i.e., being capable to host and operate an E-Service;
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Networking Facet	The Network ID characterising the Hosting Node;
consistsOf	1..n	CPU Facet	The CPU equipping the Hosting Node;
hasPersistentMemory	1..n	Memory Facet	The Disk Space Capacity of the Hosting Node;
hasVolatileMemory	1..n	Memory Facet	The RAM Capacity of the Hosting Node;
consistsOf	1..n	Event Facet	Every event characterizing the life cycle of the Hosting Node, e.g. the activation time;
consistsOf	1..1	Container State Facet	The current state of the Hosting Node, e.g. started, ready, certified, down, failed
consistsOf	0..n	Simple Property Facet	Any <key, value> pair property worth associating with the Hosting Node, e.g. Environment Variables
consistsOf	0..n	Software Facet	Any Software characterising the Hosting Node. Useful to report the hosted software that are not registered in the Resource Registry as Software Resource, e.g. Operating System
Relations
Hosting Node hosts (0..n) E-Service: A reference to any E-Service instance, the Hosting Node instance is hosting.
Hosting Node isManagedBy (0..n) Site: The Site responsible for and contributing the Hosting Node;
Hosting Node isPoweredBy (0..n) Software

Virtual Service

Virtual Service Profile extends Service Profile

Scope: An abstract service (non physically existing service) worth being represented as an existing Service for management purposes. Examples of usage include cases where classes or set of services are to be managed like an existing unit.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Software Facet	???
Relations
Virtual Service demands (0..n) Software Facet: THIS IS NOT OK / NOT SUFFICIENT
Virtual Service demands (1..n) Service

Site

Site Profile

Scope: An entity representing the location (physical or virtual) hosting and providing the resources associated with it.
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Identifier Facet	The Site Identifier;
hasContact	1..n	Contact Facet	The main contact for the Site;
hasMaintainer	1..n	Contact Facet	Contact information of the maintainer of the Site;
hasManager	1..n	Contact Facet	Contact information of the Site Manager;
consistsOf	1..n	Location Facet	...
consistsOf	1..n	Networking Facet
Relations
Site isOwnedBy (0..n) Actor
Hosting Node isManagedBy (0..n) Site

Software

Software Profile

Scope: Any Software entity worth being represented for management purposes;
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Software Facet	Software coordinates which identify the Software per se.
consistsOf	1..n	Software Facet	Apart the one connected by the isIdentifiedBy relation (gCube coordinates) the others identify the sw in other way e.g. (Maven coordinates)
consistsOf	1..n	Access Point Facet	Links to maven artifact on nexus, javadoc, wiki, svn ...
consistsOf	1..n	License Facet	The Software License characterizing its possible exploitation and use;
consistsOf	1..n	State Facet	The state characterising the software, e.g. Deprecated, Active, Obsolete
hasCapability	0..n	Capability Facet
Relations
Software dependsOn (0..n) Software: to capture any dependency between two software artifacts.
Software isConfiguredBy (0..n) Configuration Template: E.g. Accounting Sw uses it to discover the configuration
Software requires (0..n) Service: to capture any dependency between a software artifact and a Service, e.g. A software requiring a specific database.
Virtual Service demands (0..n) Software: CHECK #Service can be used instead of Software;
E-Service runs (0..n) Software
Hosting Node isPoweredBy (0..n) Software
Plugin isPluginOf (0..n) Software: to capture the relation between a Software and its Plugins;

Plugin

Plugin Profile extends Software Profile

Scope: A piece of Software extending the capabilities of another Software (main) and requiring the main Software to be executed;
Relation	Multiplicity	Target	Description
Facets
isIdentifiedBy	1..n	Software Facet	Software coordinates which identify the Plugin per se.
Relations
Plugin isPluginOf (1..n) Software: A reference to the Software this Plugin is conceived to extend the capabilities.
Running Plugin runsPlugin (0..n) Plugin

Best practices and guidelines

• On Facet instances "reuse" across Resource Profiles:
  • This can be guaranteed automatically by the system, if and just in the case the system want to avoid duplication of information. It is based on a configuration policy;
  • This MUST be done only when a change in a facet instance MUST affect a change in all Resources connected to such a Facet.

Suggested Extensions

The gCube Resource Model supports extensions at runtime meaning that new facets, relations, and resources can be defined and registered at any time by authorized clients. Those extensions must necessarily specialize an existing gCube Entity. An example of those specializations is the following:

Functionality Related Facet

The goal of this facet is to capture what are the facilities supported by the Service Entity and it aims to model the service interface.

Functionality Related Facet extends Facet

Name	Type	Description	Attributes
name	String	...
description	String	...
input	String	...
output	String	...
Known Usage
Source	Relation	Multiplicity	Target	Description
Service	consistsOf	0..n	Functionality Related Facet	...

Internal Entity and Relation

For internal use only are defined the following entity and relation:

• Context
• isParentOf

Context

Model a Context (aka scope)

isParentOf

Source	Target	Description
Context	Context