OWLlink Extension:
Retraction HTTP/XML Binding

Abstract

OWLlink provides a declarative interface for – among other things – asserting OWL axioms to a Knowledge Base (KB) of an OWL reasoner. This OWLlink extension adds the ability to retract previously asserted axioms from KBs. This document describes the accompanying HTTP/XML Binding of this extension.

Status of this Document

Please Comment

The OWLlink Working Group seeks public feedback on this Working Group Recommendation. Please send your comments to public-comments@owllink.org or post to the public discussion forum at http://www.owllink.org/forum/.

Set of Documents

This extension is being published as one of a set of 4 documents:

1. Retraction Structural Specification
2. Retraction HTTP/XML Binding (this document)
3. Retraction HTTP/Functional Binding
4. Retraction HTTP/S-Expression Binding

1 HTTP/XML Binding

The HTTP/XML binding of this extension follows the guidelines [OWLlink HTTP/XML Binding] and consists of the following two documents:

• http://www.owllink.org/ext/retraction-def-20091116.xsd which defines the new Retract element:
  <?xml version="1.0" encoding="UTF-8"?>
  <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
      xmlns:ol="http://www.owllink.org/owllink#"
      targetNamespace="http://www.owllink.org/ext/retraction#"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">
  
      <xsd:import namespace="http://www.owllink.org/owllink#"
          schemaLocation="http://www.owllink.org/owllink-20091116.xsd"/>
      <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
          schemaLocation="http://www.w3.org/2001/xml.xsd"/>
  
      <xsd:element name="Retract" type="ol:KBRequestWithAxioms"/>
  </xsd:schema>
  
• http://www.owllink.org/ext/retraction-20091116.xsd which redefines the OWLlink schema underlying the [OWLlink HTP/XML Binding] containing the new element:
  <?xml version="1.0" encoding="UTF-8"?>
  <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
      xmlns:ol="http://www.owllink.org/owllink#"
      xmlns:ext="http://www.owllink.org/ext/retraction#"
      targetNamespace="http://www.owllink.org/owllink#"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">
  
      <xsd:import namespace="http://www.owllink.org/ext/retraction#"
          schemaLocation="http://www.owllink.org/retraction-def-20091116.xsd"/>
      <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
          schemaLocation="http://www.w3.org/2001/xml.xsd"/>
  
      <xsd:redefine schemaLocation="http://www.owllink.org/owllink-20091116.xsd">
          <xsd:group name="Request">
              <xsd:choice>
                  <xsd:group ref="ol:Request"/>
                  <xsd:element ref="ext:Retract"/>
              </xsd:choice>
          </xsd:group>
      </xsd:redefine>
  </xsd:schema>
  

2 Example

The following XML fragment shows a sample application of the retraction extension with an example request message as follows.

A corresponding server answer could look as follows.

3 References

[OWLlink HTTP/XML Binding]

OWLlink: HTTP/XML Binding Olaf Noppens, Marko Luther, Thorsten Liebig, Michael Wessel. Working Group Recommendation, 16 November 2009, http://www.owllink.org/owllink-httpxml-20091116/. Latest version available at http://www.owllink.org/owllink-httpxml/.