Adding a check for an Assertion should be simple
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                 Key: WODEN-62
                 URL: http://issues.apache.org/jira/browse/WODEN-62
             Project: Woden
          Issue Type: Improvement
          Components: Validation
            Reporter: Arthur Ryman
         Assigned To: Arthur Ryman


Woden should be easy to extend with new assertion checks. For example, it 
should not be necessary to recompile Woden to add a new assertion check. This 
will lower the barrier of entry for Woden contributors and also allow Woden to 
be extended for new profiles, e.g. WS-I if a WSDL 2.0 profile is defined.

Here is a candidate design:
1. The set of assertions is controlled by an XML config file that lists 
assertion names, possibly scoped to components.
2. Each assertion check is implemented by a class whose name equals the 
assertion and whose interface contains a validate() method that takes a 
component and error reporter.
3. At startup, Woden reads the config file and lazily pages in the classes. If 
a class if not found, the assertion is skipped.
4. At validation time, Woden walks the component tree and calls the in-scope 
assertion checking classes.

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