[bdbxml] Query problem

Hi,
I'm trying to search for substring in BDBXML, but I have no luck.
Basic XML structure is like this:
<SYNSET>
<ID>ENG20-00001740-a</ID>
<SYNONYM>
<LITERAL>breathe</LITERAL>
<LITERAL>take a breath</LITERAL>
</SYNONYM>
</SYNSET>

I have index node-element-equality-string and 
node-element-substring-string on LITERAL.
If I use a query /SYNSET[SYNONYM/LITERAL="something"], I get correct
results. But if I try /SYNSET[contains(SYNONYM/LITERAL, "something")], I
get error saying:
Error: SequenceType matching failed: the sequence contains more than one
item [err:XP0006]

Please, how can I search using contains() or starts-with()?
Thanks for any help.

-- 
Adam Rambousek
email: [email protected]   www: http://www.pohadkovychlum.cz



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