XSL Append & XSL Variable !!!

Question

Hi,
If anyone has any ideas on the below problem I would sincerely appreciate it as it is driving me crazy!!!
I need to concatenate/append the contents of a Collection node into a string variable, such that each element is comma seperated in the string. I need to do this to pass the string of comma seperated values into a 3rd party service that I am calling. It looks like I would use an XSL transform to achieve this. However, it appears to be impossible because Oracle Transform mapper does not support <xsl:variable> ie. I get "unsupported" when I try to use this.
So,for example, I want to convert the following collection
<NamesCollection>
<name>A</name>
<name>B</name>
<name>C</name>
<name>D</name>
<name>E</name>
<name>F</name>
<name>G</name>
<name>H</name>
</NamesCollection>
...such that it would become:
<NAMES>A,B,C,D,E,F,G,H</NAMES>
I found some sample XSL code in google:
<xsl:variable name="String">
<xsl:for-each select="/NamesCollection">
<xsl:value-of select="name" />
<xsl:text>,</xsl:text>
</xsl:for-each>
</xsl:variable>
However, Oracle mapper does not support "xsl:variable". So the above is no good.
I cannot also nest a "for-each" inside a node,
Eg.
<NAMES>
<xsl:for-each select="/NamesCollection">
<xsl:value-of select="name"/>
</xsl:for-each>
</NAMES>
because it complains:
Error: Invalid Usage of <for-each> Element
If anyone has any suggestions, they would be sincerely appreciated !!!!!!!!!

Answer 1

Humm...
You can iterate trough your NamesCollection (see <HOME>\integration\orabpel\samples\tutorials\112.Arrays sample).
After, for each <name>, you can use an "Assign" activity to append all names to another variable.
The trick here is to edit the "Assign" source code on process.bpel (because the default behaviour is to replace the value, not append). You have to use a BPEL extension:
<assign name="Assign_1">
<bpelx:append>
<bpelx:from concat(bpws:getVariableData(eachName_Variable),",") />
<bpelx:to variable="namesWithComma_Variable" />
</bpelx:append>
</assign>
Logic:
<IterateOver NamesCollection>
<get one name>
<concat it with a comma>
<concat it with other names>
<loop iterate>