Add strict schema docs

docs/schema/index.md

@@ -4,6 +4,16 @@ The Open Contracting Data Standard is maintained using JSON Schema.
 
 In this section you will find the schemas for [releases](release) and [records](record) along with the schemas for [packaging](packaging/index.md), which act as envelopes for releases and records.
 
+```{admonition} Working on a new implementation or looking to improve data quality?
+:class: attention
+
+To improve the quality of your data and to increase compatibility with future versions of OCDS, you are encouraged to use the 'strict' versions of the schemas.
+
+The strict schemas add additional validation rules planned for inclusion in OCDS 2.0. Use of the strict schemas is a voluntary opportunity to improve data quality.
+
+To browse the strict schemas, use the interactive browsers for the [release schema](release), the [record schema](record), the [release package schema](packaging/release_package) and the [record package schema](packaging/record_package).
+```
+
 The [release schema reference](reference) provides guidance on using each of the [sections](reference.md#release-structure) and [building blocks](reference.md#building-block-reference) in the schema, and the [record schema reference](records_reference) provides additional information on publishing records with compiled and versioned releases.
 
 OCDS data must follow the I-JSON (Internet JSON) specification in [RFC7493](https://tools.ietf.org/html/rfc7493), according to which JSON text must be encoded using [UTF-8](https://en.wikipedia.org/wiki/UTF-8), and which introduces a number of requirements for numbers, objects and dates.

docs/schema/packaging/record_package.md

@@ -25,7 +25,17 @@ This page presents the record package schema in an interactive browser and in a
 
 Click on schema elements to expand the tree, or use the '+' icon to expand all elements. Use { } to view the underlying schema for any section. Required fields are indicated in **bold**. [Deprecated fields](../../governance/deprecation) are omitted.
 
-<script src="../../../_static/docson/public/js/widget.js" data-schema="../../../record-package-schema.json"></script>
+````{tab-set}
+
+```{tab-item} Record package schema
+<script src="../../_static/docson/public/js/widget.js" data-schema="../../../record-package-schema.json"></script>
+```
+
+```{tab-item} Strict record package schema
+<script src="../../_static/docson/public/js/widget.js" data-schema="../../../strict/record-package-schema.json"></script>
+```
+
+````
 
 ## Reference table
 

docs/schema/packaging/release_package.md

@@ -25,7 +25,17 @@ This page presents the release package schema in an interactive browser and in a
 
 Click on schema elements to expand the tree, or use the '+' icon to expand all elements. Use { } to view the underlying schema for any section. Required fields are indicated in **bold**. [Deprecated fields](../../governance/deprecation) are omitted.
 
-<script src="../../../_static/docson/public/js/widget.js" data-schema="../../../release-package-schema.json"></script>
+````{tab-set}
+
+```{tab-item} Release package schema
+<script src="../../_static/docson/public/js/widget.js" data-schema="../../../release-package-schema.json"></script>
+```
+
+```{tab-item} Strict release package schema
+<script src="../../_static/docson/public/js/widget.js" data-schema="../../../strict/release-package-schema.json"></script>
+```
+
+````
 
 ## Reference table
 

docs/schema/record.md

@@ -12,4 +12,14 @@ Click on schema elements to expand the tree, or use the '+' icon to expand all e
 This page presents the record schema in an interactive browser. You can also download the canonical version of the record schema as [JSON Schema](../../build/current_lang/record-schema.json) or view it as [tables](records_reference).
 ```
 
+````{tab-set}
+
+```{tab-item} Record schema
 <script src="../../_static/docson/public/js/widget.js" data-schema="../../../record-schema.json"></script>
+```
+
+```{tab-item} Strict record schema
+<script src="../../_static/docson/public/js/widget.js" data-schema="../../../strict/record-schema.json"></script>
+```
+
+````

docs/schema/release.md

@@ -12,4 +12,14 @@ Click on schema elements to expand the tree, or use the '+' icon to expand all e
 This page presents the release schema in an interactive browser. You can also download the canonical version of the release schema as [JSON Schema](../../build/current_lang/release-schema.json), download it as a [CSV spreadsheet](../../build/current_lang/release-schema.csv), view it as [tables](reference), or access it through the [Field-Level Mapping Template](https://www.open-contracting.org/resources/ocds-field-level-mapping-template/).
 ```
 
+````{tab-set}
+
+```{tab-item} Release schema
+<script src="../../_static/docson/public/js/widget.js" data-schema="../../../release-schema.json"></script>
+```
+
+```{tab-item} Strict release schema
 <script src="../../_static/docson/public/js/widget.js" data-schema="../../../release-schema.json"></script>
+```
+
+````