My original title is misleading. The if-expression I'm trying to use is defined by XPath, not XSLT.

OxygenXML is rejecting the following usage with "Unknown system function: if"
I have XPath level set to 2.0

<xsl:variable name="qd"
select="if(value/qDisplay/text() eq '')
then 'empty'
else 'right'"/>

Is this syntactically correct?

Never mind, I was able to figure out the problem. The providers of the web service don't have a clue. The parameters are defined as string types, but they're expecting xml. I was providing unescaped xml, but since the types are strings, the xml has to be escaped. Why they didn't specify the expected...

I get org.apache.commons.httpclient.HttpException : <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2...