Implementing parser service for building form elements based on RNG schema
Merge branch 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex:
  Hidding metadata schemes when creating a new XML document.
  Changing log messages to the XMD log manager and allowing to create metadata files for XML documents.