BUG #6395: Invalid XPath expression

The following bug has been logged on the website:

Bug reference: 6395
Logged by: Franco Ricci
Email address: franco(dot)ricci(at)phys(dot)uniroma1(dot)it
PostgreSQL version: 9.1.2
Operating system: FreeBSD 9
Description:

Query at bottom returns:
"ERROR: invalid XPath expression
DETAIL: Invalid expression

********** Error **********

ERROR: invalid XPath expression
SQL state: XX000
Detail: Invalid expression"

The same query on PostgreSQL 9.x works fine!

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SELECT
xpath('/llrp:RO_ACCESS_REPORT/llrp:TagReportData/llrp:*[contains(name(),\"EPC\")]/llrp:EPC/text()',

'<llrp:RO_ACCESS_REPORT
xmlns:llrp="http://www.llrp.org/ltk/schema/core/encoding/xml/1.0"
Version="1" MessageID="8">
<llrp:TagReportData>
<llrp:EPC_96>
<llrp:EPC>04954524D0004980B0DF0001</llrp:EPC>
</llrp:EPC_96>
<llrp:ROSpecID>
<llrp:ROSpecID>100</llrp:ROSpecID>
</llrp:ROSpecID>
</llrp:TagReportData>
</llrp:RO_ACCESS_REPORT>'::xml

, ARRAY[ARRAY['llrp',
'http://www.llrp.org/ltk/schema/core/encoding/xml/1.0']])
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