Conformance for MDITA authoring applications

Applications that support MDITA authoring MAY: in addition to being an Mdown editor...

• Provide guided authoring for MDITA topics, by presenting MDITA components in valid order and number.
• Support authors in inserting components from the MDITA extended profile, where necessary, to use Lightweight DITA features that are not available in the MDITA core profile.
• Limit authors to components of GitHub Flavored Markdown that are legal in MDITA core profile topics, or flag components that are not legal in MDITA topics.
• Support authors in authoring MDITA maps to define sets of MDITA topics.