Strange behavior when performing query

Hi all,
I'm getting some odd behavior when doing different kinds of queries and am hoping someone here can help out. I have a database with continuously updated PDML data (http://www.nbee.org/doku.php?id=netpdl:pdml_specification). I am opening anf querying the database from a seperate application. This appears to work fine for certain types of queries, and fails for other types with error messages that don't seem relevant. Specifically, some queries that use the attribute axis as the last leaf seem to get fouled up. Here are some example queries and the results I get:
First some queries that work:
Query: "string(collection()[1]/packet[1]/proto[1]/field[1]/@size)"
Result:
A valid number
Query: "collection()//proto[@name='geninfo']/field[@name='len']"
Result:
<field name="len" pos="0" show="64" showname="Packet Length" value="40" size="64"/>
<field name="len" pos="0" show="64" showname="Packet Length" value="40" size="64"/>
<field name="len" pos="0" show="64" showname="Packet Length" value="40" size="64"/>
Now some queries that don't work:
Query: "collection()//packet/proto/field/@size"
Result:
Output to stdout - "Transaction specified for a non-transactional database"
and an Exception with message - "Error: Invalid argument"
Query: "collection()//proto[@name='geninfo']/field[@name='len']/@name" (notice it's almost identical to above working query except with @name)
Result:
Same as above, an stdout about transactions and an exception about invalid arguments
What I find most interesting is that both errors (the one printed to stdout and the one I get in my exception) don't seem to have anything to do with the problem. I know the transactional stuff isn't messed up because the exact same code works for certain queries. I'm not sure about the "Error: Invalid argument" exception, but it's not very helpful by itself. I'm using the Java library and DBXML version 2.4.16. Anyone have any ideas what's going on?
Thanks,
Dave

As a follow-up, it appears that I just needed to wrap my attributes in the XPath string() function. For example "collection()//packet/proto/field/@size" does not work while "collection()//packet/proto/field/string(@size)" works fine.
I'm still not sure why it's spitting out an error message to stdout about transactions not being enabled when the only real error is with the query, but at least it's working now.

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