how to warn about missing xml node?

a <#macro of mine typically gets parameters of the kind
  pathFileBaseName=xml.site.files.thisFilename.@baseName
out of
  <#assign xml = pp.loadData("xml", "site.xml")>

if for some reason, the not thisFilename was forgotten in site.xml, I would
like the macro to print
what it got in the parameter literally.

However, if I do
   <#if pathFileBaseName?has_content?string = "false">
       <@pp.warning message="pathFileBaseName ${pathFileBaseName} not found
in \
site.xml" />
   </#if>

I still get
     [fmpp] Expecting a string, date or number here, Expression
pathFileBaseName
 is instead a freemarker.ext.dom.NodeListModel

but I would like to see whether this is "thisFilename" or "thisFilename1" or
"thisFilename2"
how would one do that?



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