# 102 - add Layer encoder/decoders for AuthorityURL / Identifier + advertised property

Apologies if they are several commits. Here this will clarify:
*The 4 main commits separate encoder vs. decoder & GS 2.1 vs. GS>=2.2 support.
- encoder for AuthorityURL/Identifier/advertised (GS>=2.2)
- specific encoders in GSLayer for GS=2.1
- decoders +fix/add other methods
- add decoders for GS 2.1 + tests

*Only 3 minor commits were made during the task to improve some tests & update javadoc:
- update RESTLayer javadoc
- fix GSLayerEncoder21Test 
- improve GSLayerEncoder21 tests

Missing tests were also included (LayerDecoder tests)

Many thanks in advance for your review.

Emmanuel