Extensions to the LDML.de language by providing custom schema definition files (xsd).
Use the metadata.xsd schema for a custom akn:proprierary
section to define metadata that is not included in the current LDML.de specification.
The fixtures/ldml1.6_ds_regelungstext.xsd
helps with testing by referencing all schema definitions used when validating a regelungstext. This is used for testing only.