JFS Index problem

Hello All,
I'm having problems getting an index to work as desired. Here is the (simplified) object that
I'm indexing:

<xml>
<com>
</com>

I'm wanting to create an index on "contextId". So I created something like this:

<jazz>
<jazz>
</jazz>

This works fine, resulting in the desired index (note: much is removed for ease of reading the
important parts):

<rdf>
<rdf>
<j>_9BuyEOXpEd60E_5OPtwWDg</j>
</rdf>
</rdf>

However, this only works for "TextContext" elements. I actually cannot predict the name of the
element, so I tried this:

<jazz>
<jazz>
</jazz>

I believe this should produce the same results, but instead it produces nothing. What am I doing
wrong here?

Thanks in advance!

--Stephen