Expanded guidance on additional tags

docs/schema/codelists.md

@@ -22,6 +22,8 @@ Codes are case-sensitive, and are generally provided as English language camelCa
 
 A contracting process can result in a number of releases of information over time. These must be tagged to indicate the stage of the contracting process they relate to.
 
+Additional codes may be used to label releases, based on user needs: for example, to indicate the notice or form to which a release corresponds.
+
 ```{csv-table-no-translate}
 :header-rows: 1
 :widths: auto

requirements.txt

@@ -3,6 +3,6 @@
 # Add your own requirements below.
 
 linkify-it-py
-sphinxcontrib-opencontracting==0.0.1
--e git+https://github.com/OpenDataServices/sphinxcontrib-jsonschema.git@75e4427b0f6f6a23dff9019aeb5d64833aab104a#egg=sphinxcontrib-jsonschema
--e git+https://github.com/OpenDataServices/sphinxcontrib-opendataservices.git@fab0ff0167d32ec243d42f272e0e50766299c078#egg=sphinxcontrib-opendataservices
+sphinxcontrib-opencontracting==0.0.3
+sphinxcontrib-opendataservices-jsonschema==0.2.0
+sphinxcontrib-opendataservices==0.1.0

schema/dereferenced-release-schema.json

@@ -27,7 +27,7 @@
     },
     "tag": {
       "title": "Release Tag",
-      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. Tags can be used to filter releases and to understand the kind of information that releases might contain.",
+      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. A tag labels the release: for example, as corresponding to a particular stage of the contracting process. Codes outside the releaseTag codelist might indicate, for example, the notice or form to which the release corresponds, or the event that triggered the publication of the release.",
       "type": "array",
       "items": {
         "type": "string"

schema/release-schema.json

@@ -27,7 +27,7 @@
     },
     "tag": {
       "title": "Release Tag",
-      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. Tags can be used to filter releases and to understand the kind of information that releases might contain.",
+      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. A tag labels the release: for example, as corresponding to a particular stage of the contracting process. Codes outside the releaseTag codelist might indicate, for example, the notice or form to which the release corresponds, or the event that triggered the publication of the release.",
       "type": "array",
       "items": {
         "type": "string"