README updated after introducing Tags for version control on gitlab

README.md

The oneM2M Base Ontology
==============
-This is a private repository for developing the oneM2M base ontology
-The default branch will contain individual versions of the .owl files of the base ontology 
-(e.g. "base_ontology-v_3_5_0.owl"), matching the versions of TS-0012, which can be found at
-http://onem2m.org/technical/latest-drafts
-The repository will also contain a file "base_ontology.owl" which contains the latest version of the base ontology.
-For use in an ontology browser, e.g. Protege, one needs to use the link to the RAW version of the file, e.g. 
-https://git.onem2m.org/MAS/BaseOntology/raw/master/base_ontology.owl
-General
+This the repository of oneM2M for developing the oneM2M base ontology
+The 'master' (default) branch contains the current version of the base ontology as file: base_ontology.owl
+For each new version of the ontology a new branch has been created, e.g. 'Creating_version_3_6', which subsequently was merged into 'master'.
+After merging, a TAG, indicating the new version, is created. 
+Under this tag the file: base_ontology.owl contains the indicated version of the base ontology.
+E.g. for tag 3_6_0 you will find the version 3_6_0 of the base ontology at the URL:
+https://git.onem2m.org/MAS/BaseOntology/blob/3_6_0/base_ontology.owl
+The versions of the ontology match the versions of TS-0012, which can be found at http://onem2m.org/technical/latest-drafts
+For use in an ontology browser, e.g. Protege, one needs to use the link to the RAW version of the file. 
+The link to the latest version of the base ontology is:
+    https://git.onem2m.org/MAS/BaseOntology/raw/master/base_ontology.owl
+The link to a specific version is:
+    https://git.onem2m.org/MAS/BaseOntology/raw/TAG/base_ontology.owl
+E.g. for version 3_6_0 the TAG is 3_6_0. For loading that version of the ontology into a browser use the URL:
+    https://git.onem2m.org/MAS/BaseOntology/raw/3_6_0/base_ontology.owl
+
+
+General information
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The classes and properties of the oneM2M base ontology are described in TS-0012.