Specobect format extension for namespaces

[poldi2015]

Problem The SpecObject XML input format has a restricted set of XML elements. Projects that use the format as a general format to exchange requirements want to extend the list of available tags to e.g. group the requirements into folders or mark a requirement as a non functional requirement. Adding unconsidred XML elements to a SpecObject file produces warnings when loaded by OFT.

Solution description Extend the SpecObject format and therefore the OFT importer by supporting own XML namespaces. Addition XML elements in this way can be marked with a custom XML namespace and are in that case ignored by OFT without warning.