Format String using XML attributes

I need to format a string based on attributes from a schema. I am attempting to do this using an Assign activity and the java embedded format string function. Here is a simplified version of what I am trying to do:
oraext:format-string('Service Error COD={0}', bpws:getVariableData('caXMLError','/CAXMLERROR/CLIERR/@COD'))
When I execute this line I get:
XPath expression failed to execute. An error occurs while processing the XPath expression; the expression is oraext:format-string('Service Error COD={0} ',bpws:getVariableData('caXMLError','/CAXMLERROR/CLIERR/@COD')). The XPath expression failed to execute;
The value at bpws:getVariableData('caXMLError','/CAXMLERROR/CLIERR/@COD' is valid because I can create a dummy xsd:string variable and set it equal to that.
I also tried to wrap the getVariableData with the get_content_as_string methods and neither worked. I also verified that my format-string function is working because when I substitute just a plain string like ‘T01’ the string is successfully created.
Any ideas what I am doing wrong or how I can accomplish this?

If the xml document is to be stored in the Oracle database with the XML SQL Utility, defne elements instead of attributes. XSU utility does not map the attributes of an xml document to the database table.
Further ref:
http://xml.coverpages.org/elementsAndAttrs.html

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