BP-136: Task API - Type of task identifier not consistently defined

http://www.osoa.org/jira/browse/BP-136

Submitted by: Ivana Trickovic

Target: ws-humantask-api.wsdl, version 1.1, PR 1

Issue Description:
Type of task identifier not consistently defined. Operations getRendering and getRenderingTypes use task identifier to obtain rendering and rendering types, respectively. They define task identifier to be of type xsd:anyType. Other operations define the identifier to be of type "xsd:anyURI".

Proposal:
Change task identifier to be of type xsd:anyURI.
The xsd snippet should look as follows:

<xsd:element name="getRendering">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="identifier" type="xsd:anyURI"/>
            <xsd:element name="renderingType" type="xsd:QName"/>
          </xsd:sequence>
        </xsd:complexType>
</xsd:element>

<xsd:element name="getRenderingTypes">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="identifier" type="xsd:anyURI"/>
          </xsd:sequence>
        </xsd:complexType>
  </xsd:element>

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