There is no direct approach to it.However,looking into ora:XSLT signature,I found that we can pass BPEL variables as properties.Alternatively,one can pass multiple inputs in SOA 11g.
First things first,
1.> params.xsd needs to be imported to project folder.The schema is structures as below:--
<?xml version="1.0" encoding="windows-1252" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://schemas.oracle.com/service/bpel/common"
targetNamespace="http://schemas.oracle.com/service/bpel/common"
elementFormDefault="qualified">
<!-- Root Element for Parameters -->
<xsd:element name="parameters">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="item" minOccurs="1" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="name" type="xsd:string"/>
<xsd:element name="value" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
3 3.> Go to the composite.xml. Add the preference property as in the example below:--
<component name="TestParams">
<implementation.bpel src="TestParams.bpel"/>
<property name="bpel.preference.myPreference">HelloThere</property>
</component>
4.
4.>Go to the BPEL editor and drag a Assign activity. Following is how the resulting source code look like:--
<assign name="Assign_1">
<copy>
<from expression="indexName"/>
<to variable=" parameterVar "
query="/ns4:parameters/ns4:item/ns4:name"/>
</copy>
<copy>
<from expression="ora:getPreference('myPreference')"/>
<to variable=" parameterVar "
query="/ns4:parameters/ns4:item/ns4:value"/>
</copy>
</assign>
5.
5.> Drag a Transform activity. This will be the transformation from parameterVar to parameterVar. Map name to name and value to value inside transformation.
<assign name="Transform_1">
<bpelx:annotation>
<bpelx:pattern>transformation</bpelx:pattern>
</bpelx:annotation>
<copy>
<from expression="ora:processXSLT('xsl/Transformation_1.xsl',bpws:getVariableData(parameterVar))"/>
<to variable=" parameterVar "/>
</copy>
</assign>
6.
6.>Once the above steps are completed. Next comes the passing of BPEL variable as third parameter in ora:XSLT signature. Inside the transformation, you need to add
<xsl:param name=" indexName "/>. Note that indexname is same as assigned to name node of the parameterVar.
Now this param can be used anywhere inside your XSLT by $indexName.
<assign name="MainXSLT">
<bpelx:annotation>
<bpelx:pattern>transformation</bpelx:pattern>
</bpelx:annotation>
<copy>
<!-- Pass the additional Parameter <i> parameterVar </i> for the XSL Parameters -->
<from expression="ora:processXSLT('TestParams.xsl',bpws:getVariableData('inputVariable','payload'),bpws:getVariableData(parameterVar))"/>
<to variable="outputVariable" part="payload"/>
</copy>
</assign>
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