Make examples buildable

It now excludes .tox from conf.py.
It locally clones docutils cheatsheet as examples (it should be noted
that cheatsheet.txt is renamed index.rst in it).

[1] https://docutils.sourceforge.io/docs/user/rst/cheatsheet.txt

Issue-ID: DOC-772

Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
Change-Id: Ifd616b797d5a48da5df77b0dfaa0613497b742d8

21 files changed, 453 insertions, 85 deletions

diff --git a/.gitignore b/.gitignore
index 3371e590b..93bb8772d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ __pycache__/
 # Distribution / packaging
 .Python
 build/
+_build
 develop-eggs/
 dist/
 downloads/
diff --git a/examples/sphinx/.readthedocs.yaml b/examples/sphinx/.readthedocs.yaml
deleted file mode 100644
index 82889b5ac..000000000
--- a/examples/sphinx/.readthedocs.yaml
+++ /dev/null
@@ -1,20 +0,0 @@
----
-# .readthedocs.yml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-# Required
-version: 2
-
-build:
-  image: latest
-
-python:
-  version: 3.7
-  install:
-    - requirements: docs/requirements-docs.txt
-
-submodules:
-   include: all
-
-sphinx:
-  configuration: docs/conf.py
diff --git a/examples/sphinx/README.md b/examples/sphinx/README.md
index e8decf9a4..ababb3834 100644
--- a/examples/sphinx/README.md
+++ b/examples/sphinx/README.md
@@ -3,64 +3,38 @@
 Examples files for a working (basic) configuration of sphinx.
 To be used by all ONAP projects (except 'doc' project).
 Extend them to reflect the needs in your project.
-Please note the different pathes, the files are located in!
 
-## FILE: tox.ini_MASTER
+We provide two directories:
+- **master**: Contains configuration files used in the **development branch**.
+- **istanbul**: Contains configuration files used in the **release branch**
+   (e.g.'istanbul'). **Important**: You need to change the 'istanbul' entries
+   in the files! Replace them with the name of the new release branch.
 
-##### USE:
-in MASTER branch of your repository
-##### PATH:
-{project}/docs
-##### TODO:
-remove _MASTER from filename
+The additional directories named *_static* and *images* and the file
+*index.rst* are required to make the examples buildable. In the respective
+directory you can execute the '*tox -e docs*' command and the build starts. 
 
-## FILE: tox.ini_NEWBRANCH
+## FILE: conf.py
+##### DESCRIPTION:
+The “build configuration file” contains (almost) all configuration needed to
+customize Sphinx input and output behavior.
 
-##### USE:
-in 'NEWBRANCH' of your repository
-##### PATH:
-{project}/docs
-##### TODO:
-remove _NEWBRANCH from filename
 
-update release name in the following lines:
-```
--chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt?h=istanbul
--chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt?h=istanbul
-```
+## FILE: conf.yaml
+##### DESCRIPTION:
+todo
 
-## FILE: conf.py_MASTER
-
-##### USE:
-in MASTER branch of your repository
-##### PATH:
-{project}/docs
-##### TODO:
-remove _MASTER from filename
-
-## FILE: conf.py_NEWBRANCH
-
-##### USE:
-in 'NEWBRANCH' of your repository
-##### PATH:
-{project}/docs
-##### TODO:
-remove _NEWBRANCH from filename
 
 ## FILE: requirements-docs.txt
+##### DESCRIPTION:
+todo
 
-##### USE:
-in both, MASTER branch and 'NEWBRANCH' of your repository
-##### PATH:
-{project}/docs
-##### TODO:
-–
 
 ## FILE: .readthedocs.yaml
+##### DESCRIPTION:
+todo
+
 
-##### USE:
-in both, MASTER branch and 'NEWBRANCH' of your repository
-##### PATH:
-{project}
-##### TODO:
-–
+## FILE: tox.ini
+##### DESCRIPTION:
+todo
\ No newline at end of file
diff --git a/examples/sphinx/istanbul/_static/css/ribbon.css b/examples/sphinx/istanbul/_static/css/ribbon.css
new file mode 100644
index 000000000..6008cb1a0
--- /dev/null
+++ b/examples/sphinx/istanbul/_static/css/ribbon.css
@@ -0,0 +1,63 @@
+.ribbon {
+  z-index: 1000;
+  background-color: #a00;
+  overflow: hidden;
+  white-space: nowrap;
+  position: fixed;
+  top: 25px;
+  right: -50px;
+  -webkit-transform: rotate(45deg);
+     -moz-transform: rotate(45deg);
+      -ms-transform: rotate(45deg);
+       -o-transform: rotate(45deg);
+          transform: rotate(45deg);
+  -webkit-box-shadow: 0 0 10px #888;
+     -moz-box-shadow: 0 0 10px #888;
+          box-shadow: 0 0 10px #888;
+
+}
+
+.ribbon a {
+  border: 1px solid #faa;
+  color: #fff;
+  display: block;
+  font: bold 81.25% 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  margin: 1px 0;
+  padding: 10px 50px;
+  text-align: center;
+  text-decoration: none;
+  text-shadow: 0 0 5px #444;
+  transition: 0.5s;
+}
+
+.ribbon a:hover {
+  background: #c11;
+  color: #fff;
+}
+
+
+/* override table width restrictions */
+@media screen and (min-width: 767px) {
+
+   .wy-table-responsive table td, .wy-table-responsive table th {
+      /* !important prevents the common CSS stylesheets from overriding
+         this as on RTD they are loaded after this stylesheet */
+      white-space: normal !important;
+   }
+
+   .wy-table-responsive {
+      overflow: visible !important;
+   }
+}
+
+@media screen and (max-width: 767px) {
+    .wy-table-responsive table td {
+        white-space: nowrap;
+    }
+}
+
+/* fix width of the screen */
+
+.wy-nav-content {
+    max-width: none;
+}
diff --git a/examples/sphinx/istanbul/_static/favicon.ico b/examples/sphinx/istanbul/_static/favicon.ico
new file mode 100755
index 000000000..cb712ebd2
--- /dev/null
+++ b/examples/sphinx/istanbul/_static/favicon.ico
diff --git a/examples/sphinx/istanbul/_static/logo_onap_2017.png b/examples/sphinx/istanbul/_static/logo_onap_2017.png
new file mode 100644
index 000000000..5d064f431
--- /dev/null
+++ b/examples/sphinx/istanbul/_static/logo_onap_2017.png
diff --git a/examples/sphinx/conf.py_NEWBRANCH b/examples/sphinx/istanbul/conf.py
index ea67c5518..1d6c7d357 100644
--- a/examples/sphinx/conf.py_NEWBRANCH
+++ b/examples/sphinx/istanbul/conf.py
@@ -7,6 +7,10 @@ linkcheck_ignore = [
     'http://localhost',
 ]
 
+exclude_patterns = [
+    '.tox'
+]
+
 intersphinx_mapping = {}
 
 html_last_updated_fmt = '%d-%b-%y %H:%M'
diff --git a/examples/sphinx/istanbul/conf.yaml b/examples/sphinx/istanbul/conf.yaml
new file mode 100644
index 000000000..44de212d1
--- /dev/null
+++ b/examples/sphinx/istanbul/conf.yaml
@@ -0,0 +1,7 @@
+---
+project_cfg: onap
+project: onap
+
+# Change this to ReleaseBranchName to modify the header
+default-version: istanbul
+#
diff --git a/examples/sphinx/istanbul/images/biohazard.png b/examples/sphinx/istanbul/images/biohazard.png
new file mode 100644
index 000000000..ae4629d8b
--- /dev/null
+++ b/examples/sphinx/istanbul/images/biohazard.png
diff --git a/examples/sphinx/istanbul/index.rst b/examples/sphinx/istanbul/index.rst
new file mode 100644
index 000000000..c7685a558
--- /dev/null
+++ b/examples/sphinx/istanbul/index.rst
@@ -0,0 +1,132 @@
+=====================================================
+ The reStructuredText_ Cheat Sheet: Syntax Reminders
+=====================================================
+:Info: See <http://docutils.sf.net/rst.html> for introductory docs.
+:Author: David Goodger <goodger@python.org>
+:Date: $Date: 2021-03-05 22:14:40 +0100 (Fr, 05. Mär 2021) $
+:Revision: $Revision: 8631 $
+:Description: This is a "docinfo block", or bibliographic field list
+
+.. NOTE:: If you are reading this as HTML, please read
+   `<index.rst>`_ instead to see the input syntax examples!
+
+Section Structure
+=================
+Section titles are underlined or overlined & underlined.
+
+Body Elements
+=============
+Grid table:
+
++--------------------------------+-----------------------------------+
+| Paragraphs are flush-left,     | Literal block, preceded by "::":: |
+| separated by blank lines.      |                                   |
+|                                |     Indented                      |
+|     Block quotes are indented. |                                   |
++--------------------------------+ or::                              |
+| >>> print 'Doctest block'      |                                   |
+| Doctest block                  | > Quoted                          |
++--------------------------------+-----------------------------------+
+| | Line blocks preserve line breaks & indents. [new in 0.3.6]       |
+| |     Useful for addresses, verse, and adornment-free lists; long  |
+|       lines can be wrapped with continuation lines.                |
++--------------------------------------------------------------------+
+
+Simple tables:
+
+================  ============================================================
+List Type         Examples (syntax in the `text source <index.rst>`_)
+================  ============================================================
+Bullet list       * items begin with "-", "+", or "*"
+Enumerated list   1. items use any variation of "1.", "A)", and "(i)"
+                  #. also auto-enumerated
+Definition list   Term is flush-left : optional classifier
+                      Definition is indented, no blank line between
+Field list        :field name: field body
+Option list       -o  at least 2 spaces between option & description
+================  ============================================================
+
+================  ============================================================
+Explicit Markup   Examples (visible in the `text source`_)
+================  ============================================================
+Footnote          .. [1] Manually numbered or [#] auto-numbered
+                     (even [#labelled]) or [*] auto-symbol
+Citation          .. [CIT2002] A citation.
+Hyperlink Target  .. _reStructuredText: http://docutils.sf.net/rst.html
+                  .. _indirect target: reStructuredText_
+                  .. _internal target:
+Anonymous Target  __ http://docutils.sf.net/docs/ref/rst/restructuredtext.html
+Directive ("::")  .. image:: images/biohazard.png
+Substitution Def  .. |substitution| replace:: like an inline directive
+Comment           .. is anything else
+Empty Comment     (".." on a line by itself, with blank lines before & after,
+                  used to separate indentation contexts)
+================  ============================================================
+
+Inline Markup
+=============
+*emphasis*; **strong emphasis**; `interpreted text`; `interpreted text
+with role`:emphasis:; ``inline literal text``; standalone hyperlink,
+http://docutils.sourceforge.net; named reference, reStructuredText_;
+`anonymous reference`__; footnote reference, [1]_; citation reference,
+[CIT2002]_; |substitution|; _`inline internal target`.
+
+Directive Quick Reference
+=========================
+See <http://docutils.sf.net/docs/ref/rst/directives.html> for full info.
+
+================  ============================================================
+Directive Name    Description (Docutils version added to, in [brackets])
+================  ============================================================
+attention         Specific admonition; also "caution", "danger",
+                  "error", "hint", "important", "note", "tip", "warning"
+admonition        Generic titled admonition: ``.. admonition:: By The Way``
+image             ``.. image:: picture.png``; many options possible
+figure            Like "image", but with optional caption and legend
+topic             ``.. topic:: Title``; like a mini section
+sidebar           ``.. sidebar:: Title``; like a mini parallel document
+parsed-literal    A literal block with parsed inline markup
+rubric            ``.. rubric:: Informal Heading``
+epigraph          Block quote with class="epigraph"
+highlights        Block quote with class="highlights"
+pull-quote        Block quote with class="pull-quote"
+compound          Compound paragraphs [0.3.6]
+container         Generic block-level container element [0.3.10]
+table             Create a titled table [0.3.1]
+list-table        Create a table from a uniform two-level bullet list [0.3.8]
+csv-table         Create a table from CSV data [0.3.4]
+contents          Generate a table of contents
+sectnum           Automatically number sections, subsections, etc.
+header, footer    Create document decorations [0.3.8]
+target-notes      Create an explicit footnote for each external target
+math              Mathematical notation (input in LaTeX format)
+meta              Document metadata
+include           Read an external reST file as if it were inline
+raw               Non-reST data passed untouched to the Writer
+replace           Replacement text for substitution definitions
+unicode           Unicode character code conversion for substitution defs
+date              Generates today's date; for substitution defs
+class             Set a "class" attribute on the next element
+role              Create a custom interpreted text role [0.3.2]
+default-role      Set the default interpreted text role [0.3.10]
+title             Set the metadata document title [0.3.10]
+================  ============================================================
+
+Interpreted Text Role Quick Reference
+=====================================
+See <http://docutils.sf.net/docs/ref/rst/roles.html> for full info.
+
+================  ============================================================
+Role Name         Description
+================  ============================================================
+emphasis          Equivalent to *emphasis*
+literal           Equivalent to ``literal`` but processes backslash escapes
+math              Mathematical notation (input in LaTeX format)
+PEP               Reference to a numbered Python Enhancement Proposal
+RFC               Reference to a numbered Internet Request For Comments
+raw               For non-reST data; cannot be used directly (see docs) [0.3.6]
+strong            Equivalent to **strong**
+sub               Subscript
+sup               Superscript
+title             Title reference (book, etc.); standard default role
+================  ============================================================
diff --git a/examples/sphinx/requirements-docs.txt b/examples/sphinx/istanbul/requirements-docs.txt
index 74a3b7a3f..74a3b7a3f 100644
--- a/examples/sphinx/requirements-docs.txt
+++ b/examples/sphinx/istanbul/requirements-docs.txt
diff --git a/examples/sphinx/tox.ini_NEWBRANCH b/examples/sphinx/istanbul/tox.ini
index 8b0a0fa04..8b5bc99bf 100644
--- a/examples/sphinx/tox.ini_NEWBRANCH
+++ b/examples/sphinx/istanbul/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = docs,
+envlist = docs,docs-linkcheck
 skipsdist = true
 
 [testenv:docs]
@@ -10,16 +10,16 @@ deps =
     -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt?h=istanbul
     -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt?h=istanbul
 commands =
-    sphinx-build -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
+    sphinx-build -W -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
     echo "Generated docs available in {toxinidir}/_build/html"
 whitelist_externals =
     echo
-    git
-    sh
 
 [testenv:docs-linkcheck]
 basepython = python3
-#deps = -r{toxinidir}/requirements-docs.txt
-commands = echo "Link Checking not enforced"
-#commands = sphinx-build -b linkcheck -d {envtmpdir}/doctrees ./ {toxinidir}/_build/linkcheck
-whitelist_externals = echo
\ No newline at end of file
+deps =
+    -r{toxinidir}/requirements-docs.txt
+    -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt?h=istanbul
+    -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt?h=istanbul
+commands =
+    sphinx-build -W -b linkcheck -d {envtmpdir}/doctrees ./ {toxinidir}/_build/linkcheck
diff --git a/examples/sphinx/master/_static/css/ribbon.css b/examples/sphinx/master/_static/css/ribbon.css
new file mode 100644
index 000000000..6008cb1a0
--- /dev/null
+++ b/examples/sphinx/master/_static/css/ribbon.css
@@ -0,0 +1,63 @@
+.ribbon {
+  z-index: 1000;
+  background-color: #a00;
+  overflow: hidden;
+  white-space: nowrap;
+  position: fixed;
+  top: 25px;
+  right: -50px;
+  -webkit-transform: rotate(45deg);
+     -moz-transform: rotate(45deg);
+      -ms-transform: rotate(45deg);
+       -o-transform: rotate(45deg);
+          transform: rotate(45deg);
+  -webkit-box-shadow: 0 0 10px #888;
+     -moz-box-shadow: 0 0 10px #888;
+          box-shadow: 0 0 10px #888;
+
+}
+
+.ribbon a {
+  border: 1px solid #faa;
+  color: #fff;
+  display: block;
+  font: bold 81.25% 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  margin: 1px 0;
+  padding: 10px 50px;
+  text-align: center;
+  text-decoration: none;
+  text-shadow: 0 0 5px #444;
+  transition: 0.5s;
+}
+
+.ribbon a:hover {
+  background: #c11;
+  color: #fff;
+}
+
+
+/* override table width restrictions */
+@media screen and (min-width: 767px) {
+
+   .wy-table-responsive table td, .wy-table-responsive table th {
+      /* !important prevents the common CSS stylesheets from overriding
+         this as on RTD they are loaded after this stylesheet */
+      white-space: normal !important;
+   }
+
+   .wy-table-responsive {
+      overflow: visible !important;
+   }
+}
+
+@media screen and (max-width: 767px) {
+    .wy-table-responsive table td {
+        white-space: nowrap;
+    }
+}
+
+/* fix width of the screen */
+
+.wy-nav-content {
+    max-width: none;
+}
diff --git a/examples/sphinx/master/_static/favicon.ico b/examples/sphinx/master/_static/favicon.ico
new file mode 100755
index 000000000..cb712ebd2
--- /dev/null
+++ b/examples/sphinx/master/_static/favicon.ico
diff --git a/examples/sphinx/master/_static/logo_onap_2017.png b/examples/sphinx/master/_static/logo_onap_2017.png
new file mode 100644
index 000000000..5d064f431
--- /dev/null
+++ b/examples/sphinx/master/_static/logo_onap_2017.png
diff --git a/examples/sphinx/conf.py_MASTER b/examples/sphinx/master/conf.py
index d211470a6..e782429a1 100644
--- a/examples/sphinx/conf.py_MASTER
+++ b/examples/sphinx/master/conf.py
@@ -7,6 +7,10 @@ linkcheck_ignore = [
     'http://localhost',
 ]
 
+exclude_patterns = [
+    '.tox'
+]
+
 intersphinx_mapping = {}
 
 html_last_updated_fmt = '%d-%b-%y %H:%M'
diff --git a/examples/sphinx/master/conf.yaml b/examples/sphinx/master/conf.yaml
new file mode 100644
index 000000000..ab5928131
--- /dev/null
+++ b/examples/sphinx/master/conf.yaml
@@ -0,0 +1,7 @@
+---
+project_cfg: onap
+project: onap
+
+# Change this to ReleaseBranchName to modify the header
+default-version: latest
+#
diff --git a/examples/sphinx/master/images/biohazard.png b/examples/sphinx/master/images/biohazard.png
new file mode 100644
index 000000000..ae4629d8b
--- /dev/null
+++ b/examples/sphinx/master/images/biohazard.png
diff --git a/examples/sphinx/master/index.rst b/examples/sphinx/master/index.rst
new file mode 100644
index 000000000..c7685a558
--- /dev/null
+++ b/examples/sphinx/master/index.rst
@@ -0,0 +1,132 @@
+=====================================================
+ The reStructuredText_ Cheat Sheet: Syntax Reminders
+=====================================================
+:Info: See <http://docutils.sf.net/rst.html> for introductory docs.
+:Author: David Goodger <goodger@python.org>
+:Date: $Date: 2021-03-05 22:14:40 +0100 (Fr, 05. Mär 2021) $
+:Revision: $Revision: 8631 $
+:Description: This is a "docinfo block", or bibliographic field list
+
+.. NOTE:: If you are reading this as HTML, please read
+   `<index.rst>`_ instead to see the input syntax examples!
+
+Section Structure
+=================
+Section titles are underlined or overlined & underlined.
+
+Body Elements
+=============
+Grid table:
+
++--------------------------------+-----------------------------------+
+| Paragraphs are flush-left,     | Literal block, preceded by "::":: |
+| separated by blank lines.      |                                   |
+|                                |     Indented                      |
+|     Block quotes are indented. |                                   |
++--------------------------------+ or::                              |
+| >>> print 'Doctest block'      |                                   |
+| Doctest block                  | > Quoted                          |
++--------------------------------+-----------------------------------+
+| | Line blocks preserve line breaks & indents. [new in 0.3.6]       |
+| |     Useful for addresses, verse, and adornment-free lists; long  |
+|       lines can be wrapped with continuation lines.                |
++--------------------------------------------------------------------+
+
+Simple tables:
+
+================  ============================================================
+List Type         Examples (syntax in the `text source <index.rst>`_)
+================  ============================================================
+Bullet list       * items begin with "-", "+", or "*"
+Enumerated list   1. items use any variation of "1.", "A)", and "(i)"
+                  #. also auto-enumerated
+Definition list   Term is flush-left : optional classifier
+                      Definition is indented, no blank line between
+Field list        :field name: field body
+Option list       -o  at least 2 spaces between option & description
+================  ============================================================
+
+================  ============================================================
+Explicit Markup   Examples (visible in the `text source`_)
+================  ============================================================
+Footnote          .. [1] Manually numbered or [#] auto-numbered
+                     (even [#labelled]) or [*] auto-symbol
+Citation          .. [CIT2002] A citation.
+Hyperlink Target  .. _reStructuredText: http://docutils.sf.net/rst.html
+                  .. _indirect target: reStructuredText_
+                  .. _internal target:
+Anonymous Target  __ http://docutils.sf.net/docs/ref/rst/restructuredtext.html
+Directive ("::")  .. image:: images/biohazard.png
+Substitution Def  .. |substitution| replace:: like an inline directive
+Comment           .. is anything else
+Empty Comment     (".." on a line by itself, with blank lines before & after,
+                  used to separate indentation contexts)
+================  ============================================================
+
+Inline Markup
+=============
+*emphasis*; **strong emphasis**; `interpreted text`; `interpreted text
+with role`:emphasis:; ``inline literal text``; standalone hyperlink,
+http://docutils.sourceforge.net; named reference, reStructuredText_;
+`anonymous reference`__; footnote reference, [1]_; citation reference,
+[CIT2002]_; |substitution|; _`inline internal target`.
+
+Directive Quick Reference
+=========================
+See <http://docutils.sf.net/docs/ref/rst/directives.html> for full info.
+
+================  ============================================================
+Directive Name    Description (Docutils version added to, in [brackets])
+================  ============================================================
+attention         Specific admonition; also "caution", "danger",
+                  "error", "hint", "important", "note", "tip", "warning"
+admonition        Generic titled admonition: ``.. admonition:: By The Way``
+image             ``.. image:: picture.png``; many options possible
+figure            Like "image", but with optional caption and legend
+topic             ``.. topic:: Title``; like a mini section
+sidebar           ``.. sidebar:: Title``; like a mini parallel document
+parsed-literal    A literal block with parsed inline markup
+rubric            ``.. rubric:: Informal Heading``
+epigraph          Block quote with class="epigraph"
+highlights        Block quote with class="highlights"
+pull-quote        Block quote with class="pull-quote"
+compound          Compound paragraphs [0.3.6]
+container         Generic block-level container element [0.3.10]
+table             Create a titled table [0.3.1]
+list-table        Create a table from a uniform two-level bullet list [0.3.8]
+csv-table         Create a table from CSV data [0.3.4]
+contents          Generate a table of contents
+sectnum           Automatically number sections, subsections, etc.
+header, footer    Create document decorations [0.3.8]
+target-notes      Create an explicit footnote for each external target
+math              Mathematical notation (input in LaTeX format)
+meta              Document metadata
+include           Read an external reST file as if it were inline
+raw               Non-reST data passed untouched to the Writer
+replace           Replacement text for substitution definitions
+unicode           Unicode character code conversion for substitution defs
+date              Generates today's date; for substitution defs
+class             Set a "class" attribute on the next element
+role              Create a custom interpreted text role [0.3.2]
+default-role      Set the default interpreted text role [0.3.10]
+title             Set the metadata document title [0.3.10]
+================  ============================================================
+
+Interpreted Text Role Quick Reference
+=====================================
+See <http://docutils.sf.net/docs/ref/rst/roles.html> for full info.
+
+================  ============================================================
+Role Name         Description
+================  ============================================================
+emphasis          Equivalent to *emphasis*
+literal           Equivalent to ``literal`` but processes backslash escapes
+math              Mathematical notation (input in LaTeX format)
+PEP               Reference to a numbered Python Enhancement Proposal
+RFC               Reference to a numbered Internet Request For Comments
+raw               For non-reST data; cannot be used directly (see docs) [0.3.6]
+strong            Equivalent to **strong**
+sub               Subscript
+sup               Superscript
+title             Title reference (book, etc.); standard default role
+================  ============================================================
diff --git a/examples/sphinx/master/requirements-docs.txt b/examples/sphinx/master/requirements-docs.txt
new file mode 100644
index 000000000..74a3b7a3f
--- /dev/null
+++ b/examples/sphinx/master/requirements-docs.txt
@@ -0,0 +1 @@
+lfdocs-conf
diff --git a/examples/sphinx/tox.ini_MASTER b/examples/sphinx/master/tox.ini
index c5ed11775..9057fb77f 100644
--- a/examples/sphinx/tox.ini_MASTER
+++ b/examples/sphinx/master/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = docs,
+envlist = docs,docs-linkcheck
 skipsdist = true
 
 [testenv:docs]
@@ -10,16 +10,16 @@ deps =
     -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt?h=master
     -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt?h=master
 commands =
-    sphinx-build -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
+    sphinx-build -W -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
     echo "Generated docs available in {toxinidir}/_build/html"
 whitelist_externals =
     echo
-    git
-    sh
 
 [testenv:docs-linkcheck]
 basepython = python3
-#deps = -r{toxinidir}/requirements-docs.txt
-commands = echo "Link Checking not enforced"
-#commands = sphinx-build -b linkcheck -d {envtmpdir}/doctrees ./ {toxinidir}/_build/linkcheck
-whitelist_externals = echo
\ No newline at end of file
+deps =
+    -r{toxinidir}/requirements-docs.txt
+    -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt?h=master
+    -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt?h=master
+commands =
+    sphinx-build -W -b linkcheck -d {envtmpdir}/doctrees ./ {toxinidir}/_build/linkcheck