Express Yourself - With XQuery
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Key: ODE-411
URL: https://issues.apache.org/jira/browse/ODE-411
Project: ODE
Issue Type: New Feature
Components: BPEL Compilation/Parsing, BPEL Runtime
Affects Versions: 1.2
Environment: platform-independent
Reporter: Karthick Sankarachary
Assignee: Karthick Sankarachary
Fix For: 2.0
By default, the language employed in WS-BPEL queries and expressions is XPath
1.0. This is denoted by the default value of the queryLanguage and
expressionLanguage attributes, which is
"urn:oasis:names:tc:wsbpel:2.0:sublang:xpath1.0". In addition, we have
out-of-the-box support for XPath 2.0.
Given that XQuery 1.0 is fast becoming the de-facto lingua franca for querying
XML, it is only fitting that it be given first-class status in WS-BPEL.
Specifically, XQuery 1.0 goes above and beyond XPath 2.0 by offering the
capability to write conditional/switch/iterating expressions, construct
static/computed nodes, declare functions/variables, among other things.
To that end, we propose leveraging WS-BPEL's extension mechanism to support the
use of XQuery 1.0 as a query and expression language. In particular, XQuery 1.0
will be indicated by a specific value of the queryLanguage and
expressionLanguage attribute, namely
urn:oasis:names:tc:wsbpel:2.0:sublang:xquery1.0".
The context for XQuery must be initialized with a set of bindings for in-scope
variables, declarations of in-scope namespaces and a library of WS-BPEL and
core XPath functions. In theory, one may import external XQuery modules into
that context in a implementation-defined way. However, the module feature will
initially be out of scope.
Best Regards,
Karthick Sankarachary
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