to generate a urn will also generate /metadata if not exists
sets parentPid on Node.class
the MapperException is not longer used for this purpose
add label for "extend" aka P1053 aka "umfang"
modifies GET and PUT format so that they are interoperable again
- GET : transformer array will only contain ids not complex objects
- PUT : type is called contentType now. add a new Object
isDescribedBy
{
legacyId: HT12345
importedFrom: digitoolUrl
createdBy: some digitool User
}