Some time we want to pass the index of a node as a parameter to XSL. Inside the xsl we want to use that particular index to get the right node from a complex xml document.
There are many blogs already explaining how we can achieve this.
But there is a small catch in that approach. Here I am trying to explain how we can over come that issue.
As described in other blogs, the steps to pass parameters are as shown below.
1) Defining a parameter.xsd.
Parameter.xsd
----------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://schemas.oracle.com/parameters"
targetNamespace="http://schemas.oracle.com/parameters"
elementFormDefault="qualified">
<xsd:element name="parameters">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="startIndex" type="xsd:string"/>
<xsd:element name="endIndex" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
2) Define a bpel variable of type parameter
<variable name="parameters" element="ns3:parameters"/>
Note: Ensure you import the target names space in our BPEL file
xmlns:ns3="http://schemas.oracle.com/parameters"
3) Initialize the values in the above variable
<assign name="Init">
<copy>
<from expression="number(3)"/>
<to variable="parameters"
query="/ns3:parameters/ns3:startIndex"/>
</copy>
</assign>
4) Pass the variable to xsl transform function.
<from expression="ora:doXSLTransformForDoc('xsl/xForm_CustomerOrder_To_FulfillmentOrder.xsl', $inputVariable.payload, 'parameters', $parameters)"/>
5) Inside the xsl file extract the parameters and use it in the xpath expression to pick the right node.
<xsl:variable name="startIndex" select="$parameters/ns1:parameters/ns1:startIndex"/>
<xsl:variable name="endIndex" select="$parameters/ns1:parameters/ns1:endIndex"/>
Inside the xsl file if you are using this parameter value as positional search. e.g CustomerOrder/OrderLine[$startindex] it will not work
To make it working we need to type cast the above values to number while assigning to the xsl variable
<xsl:variable name="startIndex" select="
number($parameters/ns1:parameters/ns1:startIndex
)"/>
<xsl:variable name="endIndex" select="
number($parameters/ns1:parameters/ns1:endIndex
)"/>
Then it will work for positional search. If it is a text based search then this type casting is not required.
