Fix invalid XML in <iref> elements.
Replace '&' characters with entities.
Add missing semi-colons on entities
Fix invalid XML in <sref> elements.
Fix invalid doctype
Fix invalid XML comments.

"--" is not allowed inside comments:
http://en.wikipedia.org/wiki/XML#Comments
Attribute values must be in quotes
Add DTD and use it consistently
Merge pull request #14 from jwakely/invalid-xml

Fix invalid xml
Merge pull request #15 from jwakely/dtd

Add DTD and use it consistently
Prefer to use mdash entity
Fix incorrect reference as noted by Howard, improved formatting
Fix typo
Merge pull request #16 from jwakely/2219-typo

Fix typo
New basic_string issue from Juan Soulie
Add comment from Juan Soulie
Add P/R provided by Glen Fernandes
Add Howards P/R, fix wrong reference
Fix incorrect html token
Add new issue about kill_dependency template