Re: [XSLT2] setting context inside funcdefs

apply-templates would also effectively re-establish the context but in
that case the code that uses the context isn't explictitly in the function body but rather in the template that gets applied.

so probably just xsl:for-each or within an xpath2 expression of the form
<xsl:value-of select="$callers_context-node/a/b/*[localname()....

  <t:function
    name="dx:default_class_values">
    <t:param name="context">
    <t:result>
      <value-of select="local-name($context)"/>
      <t:if test="string($context/@role)">
        <t:text> </t:text>
        <t:value-of select="$context/@role"/>
      </t:if>
    </t:result>
  </t:function>

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