DB2V9.1 pureXML Creating Unique index with 2 attributes

I have a table with only 1 column as
Table   : profileTable
//--------------
profile XML;
//--------------

A sample  content of  XML file is
<sampleprofile  name="joe"  version="A123">
        <phone>123456789</phone>
...
...
</sampleprofile>
//------------------------------------

How can we create a UNIQUE index which includes both the 'name' and
'version' attributes?
I was able to create following indexes:
CREATE INDEX  index1 ON  profileTable(profile) GENERATE KEY USING
XMLPATTERN '/sampleprofile/@[EMAIL PROTECTED]
' AS VARCHAR(16)
CREATE INDEX  index2 ON  profileTable(profile) GENERATE KEY USING
XMLPATTERN '/sampleprofile/@[EMAIL PROTECTED]
' AS VARCHAR(16)

But although    '/sampleprofile/@[EMAIL PROTECTED]
 | /sampleprofile/@[EMAIL PROTECTED]
' is a
valid PATH expression I was unable to create an index like
CREATE UNIQUE INDEX  index3 ON  profileTable(profile) GENERATE KEY
USING XMLPATTERN 'sampleprofile/@[EMAIL PROTECTED]
 | /sampleprofile/@[EMAIL PROTECTED]
' AS
VARCHAR(32)

Regards
Rajesh