XML Indexer

Introduction

The XMLIndexer factory Service allow to create a GenericXMLIndexerService and a MetadataXMLIndexerService. The GenericXMLIndexerService is not implemented yet. A MetadataXMLIndexer operate over a collection of homogeneus XML documents bound to a specific MetadataCollection, this indexer can be populated, updated, recreated and queried.

Implementation Overview

XMLIndexer consist of two parts:

• MetadataXMLIndexer
  
  MetadataXMLIndexer provides the functionalities to retrieve, update, store MetadataElements into Metadata Collections.
  
  The Service expose the following operations:
  
  • AddElements(Documents[]) --> void
    This operation take a list of Documents and adds them to the current collection in exist1.1 DB. A Document is a pair of id and a String representation of the XMLDocument. This operation can be used to update elements already stored given the same id of an existing document.
    
  • AddElementsRS(String) --> void
    This operation take a string representing a reference to a RSLocator (see ResultSetService). The AddElementRS create a RSReader and stores the element readed in exist1.1 DB.
    
  • ExecuteXPath(string) --> string[]
    This operation take a string representing the XPath. It executes the XPath given on the current collection.
    
  • ExecuteXPath(string) --> string
    This operation take a string representing the XPath. It executes the XPath given on the current collection and return a string representing a reference to RSLocator (see ResultSetService).