Assigned: http://www.osoa.org/jira/browse/BP-62
From: Dieter Koenig1
[mailto:dieterkoenig@de.ibm.com]
Sent: Thursday, December 11, 2008 13:18
To: bpel4people@lists.oasis-open.org
Subject: [bpel4people] New Issue: Blocked Substitution Elements in Human
Task Definitions
Target: ws-humantask.xsd
Description: The WS-HumanTask language XML Schema contains an abstract element
"genericHumanRole" and substitution elements (such as
"potentialOwner" etc.) which are used in people assignments in place
of the abstract element. However, in a concrete task definition (an XML Schema
instance document), the schema currently does not allow this replacement. The
reason is the blockDefault="#all" attribute on the schema root
element.
Proposal: In general, it is reasonable to block substitutions and derivations
by extension/restriction for WS-HT language elements. Both languages are
already extensible by allowing elements and attributes of other namespaces to
be added to all existing language elements. It is therefore not necessary to
allow introducing substitution elements or derived types. The same approach is
used in bpel4people.xsd (and in WS-BPEL 2.0 XML Schema artifacts).
In this particular case (genericHumanRole), it is necessary to allow
substitutions in instance documents, otherwise people assignments cannot be
specified at all. This can be done by overriding the global
"blockDefault" setting by using a concrete "block"
attribute. This attribute must allow substitutions, but type derivations by
extension/restriction may still remain blocked.
As a result, the definition of the "genericHumanRole" abstract
element should be changed from:
<xsd:element name="genericHumanRole" type="tGenericHumanRole" abstract="true" />
to:
<xsd:element name="genericHumanRole" type="tGenericHumanRole" abstract="true" block="extension
restriction" />
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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IBM Deutschland |
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E-Mail: |
dieterkoenig@de.ibm.com |
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IBM Deutschland Research & Development GmbH / Vorsitzender
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