refentry.source.fallback.profile string
refentry.source.fallback.profile Specifies profile of "fallback" for refentry "source" data
refmeta/refmiscinfo[not(@class = 'date')][1]/node()

## Description

The value of refentry.source.fallback.profile is a string representing an XPath expression. It is evaluated at run-time and used only if no "source" data can be found by other means (that is, either using the refentry metadata-gathering logic "hard coded" in the stylesheets, or the value of the refentry.source.name.profile and refentry.version.profile parameters, if those are enabled).

Depending on which XSLT engine you run, either the EXSLT `dyn:evaluate` extension function (for xsltproc or Xalan) or `saxon:evaluate` extension function (for Saxon) are used to dynamically evaluate the value of refentry.source.fallback.profile at run-time. If you don't use xsltproc, Saxon, Xalan -- or some other XSLT engine that supports `dyn:evaluate` -- you must manually disable fallback processing by setting an empty value for the refentry.source.fallback.profile parameter.