Stable Versions

Since quickbook 1.3 the quickbook attribute in the document block selects which version of the language to use. Not all changes to quickbook are implemented using a version switch, it's mainly just the changes that change the way a document is interpreted or would break existing documentation.

Quickbook 1.3 and later

Introduced quickbook language versioning.
In the documentation info, allow phrase markup in license and purpose attributes.
Fully qualified section and headers. Subsection names are concatenated to the ID to avoid clashing. Example: doc_name.sect_name.sub_sect_name.sub_sub_sect_name.

Quickbook 1.5 and later

Ignore template argument separators inside square brackets.
Don't separate the final template argument if the .. separator was used. i.e. never mix .. and whitespace separators.
Statically scope templates and their arguments rather than dynamically scope them.
Give table ids, and let you set them.
Allow spaces between the : character and ids in elements which can have ids.