Added identifiers, Updated external links and the new prefix

README.md

@@ -2,11 +2,18 @@
 Linked library data project (LKD)
 
 Project coordinated by Kansalliskirjasto - The National Library of Finland
-Homepage https://www.kiwi.fi/display/LKD
+
+Project homepage https://www.kiwi.fi/display/LKD
+
+Project ID http://www.wikidata.org/entity/Q124635303
 
 ## About the LKD data model
 
-This data model is based on the BIBFRAME 2.2.0 data model published by the Library of Congress. The model has been supplemented with categories and properties from RDA Registry, as well as additions based on the Finnish description guidelines.  A notable difference to the Library of Congress BIBFRAME data model is that LKD data model splits bf:Work into lkd:Work and lkd:Expression corresponding to the structure of RDA classes.
+This BIBFRAME data model is based on the BIBFRAME 2.3.0 data model published by the Library of Congress. The model has been supplemented with categories and properties from RDA Registry, as well as additions based on the Finnish description guidelines. A notable difference to the Library of Congress BIBFRAME data model is that LKD data model splits bf:Work into disjoint classes bffi:Work and bffi:Expression corresponding to the structure of RDA classes.
+
+Namespece of the model http://urn.fi/URN:NBN:fi:schema:bffi:   Preferred prefix "bffi".
+
+Wikidata ID of the model http://www.wikidata.org/entity/Q124789177
 
 ## Versions
 Test version 0.1.0, published on 2023-01-26, comprises of the RDA elements determined by the Finnish cataloguing levels. The identifiers used are temporary and the model is not ready for use.
@@ -20,4 +27,4 @@ Test version 0.3.1, published on 2024-01-12, includes subclasses of lkd:Work and
 In test version 0.4.0, published on 2024-02-23 we have moved from temporary identifiers to permanent URN identifiers. In addition, a new prefix bffi: has been introduced. The version also completes the division of bf:Work and its subclasses into bffi:Work and bffi:Expression and their subclasses. The allocation of properties used with bf:Work is still in progress. This version also includes a new bffi-meta:relatedValueVocabulary property used to denote a concept group in a value vocabulary that contains instances of a given class.
 
 ## Conversion
-In addtion to the data model this project aims to create MARC21 to LKD conversion rules and conversion software to implement them. Backward conversion from LKD to MARC21 will be implemented, too.
+In addtion to the data model this project aims to create MARC21 to BFFI conversion rules and conversion software to implement them. Backward conversion from BFFI to MARC21 will be implemented, too.