[bpel4people] New Issue: XPath Context Undefined

[Dieter Koenig1 <dieterkoenig@de.ibm.com>]

Target:

WS-HumanTask 1.1 CD 05 revision 9
BPEL4People 1.1 CD 05 revision 2

Description:

When XPath 1.0 is used as an Expression Language in BPEL4People or
WS-HumanTask language elements then the XPath context is undefined.

The following proposal is inspired by WS-BPEL 2.0 section 8.2.4 (
http://docs.oasis-open.org/wsbpel/2.0/OS/wsbpel-v2.0-OS.html#_Ref130811481
).

Proposal:

In the WS-HumanTask specification, add a new section:
========================================
2.6 Default use of XPath 1.0 as an Expression Language
The XPath 1.0 specification [XPATH 1.0] defines the context in which an
XPath expression is evaluated. When XPath 1.0 is used as an Expression
Language in WS-HumanTask language elements then the XPath context is
initialized as follows:
-- Context node: none
-- Context position: none
-- Context size: none
-- Variable bindings: none
-- Function library: Core XPath 1.0 and WS-HumanTask functions MUST be
available and processor-specific functions MAY be available
-- Namespace declaration: all in-scope namespace declarations from the
enclosing element

Note that XPath 1.0 explicitly requires that any element or attribute used
in an XPath expression that does not have a namespace prefix must be
treated as being namespace unqualified. As a result, even if there is a
default namespace defined on the enclosing element, the default namespace
will not be applied.
========================================

In the BPEL4People 1.1 specification, add a new section:
========================================
2.6 Default use of XPath 1.0 as an Expression Language
The XPath 1.0 specification [XPATH 1.0] defines the context in which an
XPath expression is evaluated. When XPath 1.0 is used as an Expression
Language in BPEL4People or inlined WS-HumanTask language elements then the
XPath context is initialized as follows:
-- Context node: none
-- Context position: none
-- Context size: none
-- Variable bindings: all WS-BPEL variables visible to the enclosing
element as defined by the WS-BPEL scope rules
-- Function library: Core XPath 1.0, WS-BPEL, BPEL4People and WS-HumanTask
functions MUST be available and processor-specific functions MAY be
available
-- Namespace declaration: all in-scope namespace declarations from the
enclosing element

Note that XPath 1.0 explicitly requires that any element or attribute used
in an XPath expression that does not have a namespace prefix must be
treated as being namespace unqualified. As a result, even if there is a
default namespace defined on the enclosing element, the default namespace
will not be applied.
========================================


Kind Regards

Dieter König

Senior Technical Staff Member, WebSphere Process Server Architect
IBM Software Group, Application and Integration Middleware Software
WSS Business Process Solutions
                                                                       
                                                                       
                                                                       
                                                                       
                                                                       
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