[xsl] XTTE1100: A sequence of more than one item is not allowed as the @group-adjacent attribute

[Ihe Onwuka <ihe.onwuka@xxxxxxxxx>]

I am getting the above error on the following line of code

<xsl:for-each-group select="*" group-adjacent="data(
descendant::*/local-name())">

I originally tried it without wrapping it in the data function and
have also tried casting it to string (where I get a different but
similar answer).

I'm sure there is a simple answer out there.