I have added what was requested by SN on https://github.com/nmrML/nmrML/issues/113 . I did not added datatypes such as Integer32 or Float32 that are part of xml datatypes (http://www.w3.org/TR/xmlschema-2/#built-in-datatypes)
Merge branch 'master' of https://github.com/nmrML/nmrML
Merge branch 'master' of https://github.com/nmrML/nmrML
Merge branch 'master' of https://github.com/nmrML/nmrML
added documentation.