Answered: Using variables in XmlSlurper’s GPath

Yesterday I asked this question about using variables with XmlSlurper. I got an answer that works (although I don't see it anywhere in the documentation or the book Groovy in Action. Below is the example the answerer gave

def xmltxt = """
<file>
<record name="some record" />
<record name="some other record" />
</file>
"""

def xml = new XmlSlurper().parseText(xmltxt)
String foo = "record"
return xml."${foo}".size()