Can we use appliesTo="sca:binding" or appliesTo="sca:implementation" toselect all bindings or implementations?

[Raymond Feng <rfeng@us.ibm.com>]

There is a statement in the SCA Policy
Framework Version 1.1, Committee Draft 02/Public Review 01 – rev4 spec
as quoted below:

337 • @appliesTo (0..1) - a string
which is an XPath 1.0 expression identifying one or more SCA constructs
338 this policySet can configure. The
contents of @appliesTo MUST match the XPath 1.0 [XPATH]
339 production Expr.
[POL30018]

We have the following samples as we
expect them would select the concrete bindings or implementations such
as binding.ws or implementation.java:
appliesTo="sca:binding" 
appliesTo="sca:implementation"


Unfortunately such capability is only
available in XPath 2.0 where schema-element() function can be used to test
the substitutionGroup. See section 2.5.4.4 Schema Element Test of http://www.w3.org/TR/xpath20/.
I'm not sure if there are XPath implementations that support 2.0. At lease
the one from JDK only supports 1.0.

Are these usages valid? Do we always
have to give the concrete elements such as appliesTo="//sca:binding.ws
| //sca:binding.jms"?

Thanks,
Raymond

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Raymond Feng
Senior Software Engineer, Apache Tuscany PMC Member & Committer 
IBM Bay Area Lab, 1001 E Hillsdale Blvd, Suite 400,
Foster City, CA 94404, USA
E-mail: rfeng@us.ibm.com,
Notes: Raymond Feng/Burlingame/IBM, Tel: 650-645-8117,
T/L: 367-8117
Apache Tuscany: http://tuscany.apache.org
Co-author of Tuscany In Action: http://www.manning.com/laws

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