GH-321: add formal parameters to WF & COORD XML
-----------------------------------------------
Key: OOZIE-239
URL: https://issues.apache.org/jira/browse/OOZIE-239
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
Formal parameters definition with inline default values
Enforcing formal parameters a comprehensive error checking can be done at
submission time for EL expressions through out the workflow XML.
For example:
<code>
<workflow-app>
<parameters>
<!-- with no default value -->
<property>
<name>input</name>
</property>
<!-- with default value -->
<property>
<name>output</name>
<value>${input}.out</name>
</property>
...
</parameters>
...
</workflow-app>
</code>
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