Added XML Documentation policy page.

Author: bkford

docs/Development/Policies-and-Procedures/.pages

@@ -4,6 +4,7 @@ nav:
   - AI-Policy.md
   - Commit-Messages.md
   - Coding-Guidelines.md
+  - XML-Documentation.md
   - Software-Configuration-Management-Policies.md
   - Bug-Fixes.md
   - C-API-Deprecation.md

docs/Development/Policies-and-Procedures/XML-Documentation.md

@@ -0,0 +1,16 @@
+# XML Documentation
+
+Since XML documentation is done in the source tree, some of the files can become quite large. Because of this, the XML should be separated from the C files to remove clutter. When submitting a PR that requires documentation, it should be added to its corresponding XML file (or create a new one if one does not already exist). For example, chan_websocket has its own XML file (channels/chan_websocket_doc.xml). These existing files can be referred to when creating your own.
+
+Here are the requirements for the doc file:
+* The filename has to have the "\_doc.xml" suffix
+* The file must begin with:
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE docs SYSTEM "appdocsxml.dtd">
+<docs xmlns:xi="http://www.w3.org/2001/XInclude">
+```
+* To enclose the above, the file must end with:
+```xml
+</docs>
+```