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Example

We take as example the Currency Converter Service offered by http://www.webservicex.com/. You will learn how to extract ontologies from the WSDL file of the service.

Currency Converter Service Ontology

The ontology is created based on the web service's description file. Below is an excerpt from http://www.webservicex.com/CurrencyConvertor.asmx?wsdl:

<s:element name="ConversionRate">
  <s:complexType>
    <s:sequence>
      <s:element minOccurs="1" maxOccurs="1" name="FromCurrency" type="tns:Currency"/>
      <s:element minOccurs="1" maxOccurs="1" name="ToCurrency" type="tns:Currency"/>
    </s:sequence>
  </s:complexType>
</s:element>
<s:simpleType name="Currency">
  <s:restriction base="s:string">
    <s:enumeration value="EUR"/>
    <s:enumeration value="USD"/>
    ...
</s:restriction>
</s:simpleType>
<s:element name="ConversionRateResponse">
  <s:complexType>
    <s:sequence>
      <s:element minOccurs="1" maxOccurs="1" name="ConversionRateResult" type="s:double"/>
    </s:sequence>
  </s:complexType>
</s:element>
<s:element name="double" type="s:double"/>

The WSML ontology is:

wsmlVariant _"http://www.wsmo.org/wsml/wsml-syntax/wsml-flight"
namespace { _"http://oxygen.informatik.tu-cottbus.de/ontologies/currencyConverter/currencyConverterOntology#"
, 
  dc _"http://purl.org/dc/elements/1.1/", 
  xsd _"http://www.w3.org/2001/XMLSchema#", 
  wsml _"http://www.wsmo.org/wsml/wsml-syntax#"
}

ontology _"http://oxygen.informatik.tu-cottbus.de/ontologies/currencyConverter/currencyConverterOntology"
  nonFunctionalProperties
    dc#type hasValue _"http://www.wsmo.org/2004/d2#ontologies"          
    dc#description hasValue "Ontology for Currency Conversion"
    dc#subject hasValue "Currency Converter"
    dc#identifier hasValue _"http://oxygen.informatik.tu-cottbus.de/ontologies/currencyConverter/currencyConverterOntology"
    dc#title hasValue "Ontology for webservicex.com CurrencyConverter web service"
    wsml#version hasValue "$Revision: 1 $"
    dc#format hasValue "text/html"
    dc#language hasValue "en-US"
    dc#creator hasValue "Emilian Pascalau"
    dc#date hasValue "2008-04-26"
  endNonFunctionalProperties


concept ConversionRate
  nonFunctionalProperties
    dc#description hasValue "conversion rate definition"
  endNonFunctionalProperties
  FromCurrency ofType  (1 1) xsd#string
  ToCurrency ofType  (1 1) xsd#string

concept ConversionRateResponse
  nonFunctionalProperties
    dc#description hasValue "currency converter response"
  endNonFunctionalProperties
  ConversionRateResult ofType  (1 1) xsd#double

axiom FromCurrencyConstraint
  definedBy 
    !- ?x memberOf ConversionRate
  and ?x[FromCurrency hasValue ?type]
  and (?type = "USD"
  or
  ?type = "EUR"). 

axiom ToCurrencyConstraint
  definedBy 
    !- ?x memberOf ConversionRate
  and ?x[ToCurrency hasValue ?type]
  and (?type = "USD"
  or
  ?type = "EUR").