tan:feature-test-to-groups($attr-feature-test as xs:string?) as element()*
Input: any value of @feature-test
Output: the value converted into a series of <group>
ed <item>
s, observing the accepted syntax for this attribute
Example: "a b + c" - >
<item>
a</item>
</group>
<item>
b</item>
<item>
c</item>
</group>
No variables, keys, functions, or named templates depend upon this xsl:function.
Relies upon tan:normalize-text
.