Mapping web services to ontologies

• US 20060173868A1
• Filed: 04/18/2005
• Published: 08/03/2006
• Est. Priority Date: 01/31/2005
• Status: Active Grant

• Current Assignee: SemEO Services GmbH, Software AG
• Original Assignee: Ontoprise GmbH, Software AG
• Inventors: Schoning, Harald, Harbarth, Jurgen, Gesmann, Michael, Winkler, Kay, Angele, Jurgen, Waterfeld, Walter
• Granted Patent: US 7,487,166 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/84 Mapping; Conversion
• CPC Class Codes: Y10S 707/99933 Query processing, i.e. searching
• CPC Class Codes: Y10S 707/99936 Pattern matching access
• CPC Class Codes: Y10S 707/99943 Generating database or data structure, e.g. via user interface
• CPC Class Codes: Y10S 707/99945 Object-oriented database structure processing

Abstract

A system for enterprise information integration is described. The system is based on different layers: the data sources, source ontologies corresponding to the data schema of the data sources, an integration ontology integrating the different source ontologies, a level of query input, preferably in the form of a web service. Between the levels, mapping rules are used. For the mapping of document style web services and XML documents to ontologies detailed rules are given, covering i.a. simpleContent and complexContent elements, which are mapped to class properties and relations (object properties), respectively.

Claims

1. A Method for mapping an XML data structure to an ontology comprising:

providing an XML document with a corresponding XML schema definition;

a) mapping XML schema declarations and definitions to ontology schema definitions in the following way;

mapping XML element and attribute declarations to ontology property definition;

mapping XML complexType definitions to ontology class definitions;

b) if information (PSVI annotation) from the validation of the XML document by the XML schema is used, mapping XML nodes with a known PSVI-type in the following way to ontology instances;

mapping PSVI complexType annotations to ontology class instances;

mapping element and attribute nodes to ontology property instances;

c) defining the following predefined ontology schema definitions;

defining a predefined ontology class definition and a predefined ontology datatype property definition and a predefined object property definition;

d) if the XML document has been validated by the XML schema, mapping XML nodes without PSVI-type annotation to ontology instances and ontology definitions in the following way;

mapping XML element and attribute nodes to ontology property instances and ontology class instances.

2. The method according to claim 1 comprising the steps of:

a) mapping XML schema declarations and definitions to ontology schema definitions in the following way;

a1) mapping an XSD complexType definition to a class definition of the ontology;

a2) mapping an XSD complexContent element declaration of an XSD complexType definition to an object property definition of the ontology, the object property having a domain class and a range class, the domain class being the class where the element is used, and the range class of the object property being the class to which the complexType of the complexContent element is mapped;

a3) mapping an XSD simpleType element declaration to a datatype property definition of the ontology, the datatype property having a domain class, the domain class being the class where the element is used, and the range type being the XML schema type of the simpleType element declaration;

a4) mapping an XSD simpleContent element declaration with an attribute to an object property definition of the ontology, the object property having a domain class and a range class, the domain class being the class where the element is used, and the range class of the object property being the class to which the complexType of the simpleContent element is mapped;

a5) mapping an XSD attribute declaration to a datatype property definition of the ontology, the datatype property having a domain class, the domain class being the class where the element is used, and the range type being the XML schema type of the attribute declaration;

3. The method according to claim 1 comprising the steps of:

b) if information (PSVI annotation) from the validation of the XML document by the XML schema is used, mapping XML nodes with a known PSVI-type in the following way to ontology instances;

b1) for each XML element node with a complexType annotation an instance of a class of the ontology is generated, the class of this instance is the class to which this complexType definition is mapped;

b2) mapping an XML simpleType element node to a datatype property instance of the ontology, the domain class instance of the datatype property instance being the instance which is generated for the PSVI type annotation where the element node is used;

b3) mapping an XML simpleContent element node with an attribute to an object property instance of the ontology, the object property having a domain class instance and a range class instance, the domain class instance of the object property instance being the instance which is generated for the type annotation where the element is used, the range class instance of the object property instance being the class instance which is generated for the PSVI type annotation of the XML simpleContent element node;

b4) mapping an XML complexContent element node to an object property instance of the ontology, the object property having a domain class instance and a range class instance, the domain class instance of the object property instance being the instance which is generated for the PSVI type annotation where the element is used, and the range class instance of the object property instance being the class instance which is generated for the PSVI type annotation of the XML complexContent element node;

b5) mapping an XML simpleType attribute node to a datatype property instance of the ontology, the domain class instance of the datatype property instance being the instance which is generated for the PSVI type annotation where the attribute node is used;

4. The method according to claim 1 comprising the steps of:

c) defining the following predefined ontology schema definitions;

c1) a single class definition which is a super class of all generated class definitions;

c2) a single object property definition which is a super object property of all generated object property definitions, the object property having a domain class and a range class, which are said super class;

c3) a single datatype property definition which is a super datatype property of all generated datatype property definitions, the datatype property having a domain class which is said super class, the range type being any atomic type;

5. The method according to claim 1 comprising the steps of:

d) if the XML document has been validated by the XML schema, mapping XML nodes without PSVI-type annotation to ontology instances and ontology definitions in the following way;

d1) for each XML element node which is not a leaf-node

d1a) an instance of the predefined super class of all generated classes of the ontology is generated; and

d1b) an object property instance of the predefined super object property is generated, the domain class instance of the object property instance being the instance which is generated for the containing element node and the range class instance being the class instance which is generated for this XML element node;

d2) for each XML leaf element node without attribute nodes a datatype property instance of the predefined super datatype property is generated, the domain class instance of the datatype property being the instance which is generated for the containing element node;

d3) for each XML leaf element node with an attribute node an object property instance of the predefined super object property is generated, the domain class instance of the object property being the instance which is generated for the containing element node, and the range class instance being the class instance which is generated for this element node;

d4) for each XML attribute node a datatype property instance of the predefined super datatype property is generated, the domain class instance of the datatype property being the instance which is generated for the element node to which the attribute belongs.

6. Mapping document style web services to an ontology whereby the mapping of the XML data structure needed therefore is accomplished according to claim 1.

7. The method according claim 6

characterized in that

for mapping an XML web service to an ontology the following steps are performed:

providing an XML SOAP webservice with a corresponding web service description (WSDL);

a) mapping the WSDL definitions to ontology schema definitions in the following way;

mapping an operation definition to a class definition of the ontology;

mapping a part definition to an ontology property definition;

b) the input and output message of the SOAP request are mapped in the following way to ontology instances;

a single SOAP request is mapped to a single ontology class instance;

the element nodes representing the parts of the input and output message are mapped to ontology property instances.

8. The method according to claim 7 comprising the steps of:

a) mapping the WSDL definitions to ontology schema definitions in the following way;

a1) mapping an operation definition to a class definition of the ontology;

a2) if the part of the input or output message is defined as an complexContent element declaration, it is mapped to an object property definition of the ontology, the object property having a domain class and a range class, the domain class being the class which is mapped from the operation definition, and the range class of the object property being the class to which the complexType of the complexContent element is mapped;

a3) if the part of the input or output message is defined as an XSD simpleType element declaration without attributes, it is mapped to a datatype property definition of the ontology, the datatype property having a domain class, which is mapped from the operation definition and the range type being the XML schema type of the simpleType element declaration;

a4) if the part of the input or output message is defined as an XSD simpleContent element declaration with an attribute, it is mapped to an object property definition of the ontology, the object property having a domain class and a range class, the domain class being the class, which is mapped from the operation definition, and the range class of the object property being the class to which the complexType of the simpleContent element is mapped.

9. The method according to claim 7 comprising the steps of:

b) the input and output message of the soap request are mapped in the following way to ontology instances;

b1) for each SOAP request of an operation an instance of a class of the ontology is generated, the class of this instance is the class to which this operation definition is mapped;

b2) if the input or output message contains XML simpleType element node it is mapped to a datatype property instance of the ontology, the domain class instance of the datatype property instance being the instance which is generated for the operation of the SOAP request;

b3) if the input or output message contains an XML simpleContent element node with an attribute it is mapped to an object property instance of the ontology, the object property having a domain class instance and a range class instance, the domain class instance of the object property instance being the instance which is generated for the operation of the SOAP request, the range class instance of the object property instance being the class instance which is generated for the PSVI type annotation of the XML simpleContent element node;

b4) if the input or output message contains an XML complexContent element node it is mapped to an object property instance of the ontology, the object property having a domain class instance and a range class instance, the domain class instance of the object property instance being the instance which is generated for operation of the SOAP request, and the range class instance of the object property instance being the class instance which is generated for the PSVI type annotation of the XML complexContent element node.

11. A computer loadable data structure, that is adapted to perform the method according to the method claim 1 while the data structure is being executed on a computer.

12. Computer program, wherein the computer program is adapted to perform the method according to the method claim 1 while the computer program is being executed on a computer.

13. Computer program comprising program means for performing the method according to the method claim 1 while the computer program is being executed on a computer or on a computer network.

14. Computer program comprising program means to perform the method according to the method claim 1, wherein the program means are stored on a storage medium readable to a computer.

15. A storage medium, wherein a data structure is stored on the storage medium and wherein the data structure is adapted to perform the method according to the method claim 1 after having been loaded into a main and/or working memory of a computer or of a computer network.

16. Computer program product having program code means, wherein the program code means can be stored or are stored on a storage medium, for performing the method of the method claim 1, if the program code means are executed on a computer or on a computer network.

17. At least one of an operating system, a computer readable medium having stored thereon a plurality of computer-executable instructions, a co-processing device, a computing device and a modulated data signal carrying computer executable instructions for performing the method of claim 1.

10. Ontology definition in which an object or datatype property of an ontology class can be marked as grounded.