Propose TCK Validation extension to check for DMN namespace uniqueness

[tarilabs]

within each given TCK test case folder(s).

[tarilabs]

Demonstration using 193cf93

in job log tail:

in job log is reported the full exception message:

testDMNFilesUniqueInNamespace[TestCase 0001-filter](org.omg.dmn.tck.validation.TestCasesFiles)  Time elapsed: 0.007 sec  <<< ERROR!
java.lang.RuntimeException: There are 2 or more files with the same DMN namespace: http://www.trisotech.com/definitions/_f52ca843-504b-4c3b-a6bc-4d377bffef7a
in the folder: ../../TestCases/compliance-level-3/0001-filter
these files are: [../../TestCases/compliance-level-3/0001-filter/0001-filter.dmn, ../../TestCases/compliance-level-3/0001-filter/0001-filter2.dmn]

[tarilabs]

If there is consensus about namespace uniqueness between models which are related by an import relationship as per #272 (comment) then this TCK Validation test case folder check:

ensures within a given TCK test case folder, the *.dmn models file have a unique namespace --within that TCK test case folder.

[StrayAlien]

Thanks @tarilabs - seems fair enough given the recent discussions.

[agilepro]

discussed on May 24. Agreed that this is OK to go. Just waiting for the end of the month.