{
org.apache.xalan.xpath.XPathSupport execContext = context.processor.getExecContext();
XObject xobj = context.processor.getStylesheet().evalXPathStr(execContext, fileNameExpr,
context.sourceNode,
execContext.getNamespaceContext());
fileName = xobj.str();
if((null == fileName) || (fileName.length() == 0))
{
fileName = ((ElemExtensionCall)elem).getAttribute ("file", context.sourceNode, context.processor);
}
}