Semantic tagging in Markdown

Question

I\'d like to take class notes using a simple text editor and Markdown. Is there a way to tag elements of the text to make them machine readable?

For example, I\'d like

Answer 1

If you use Kramdwon or Maruku to parse your Markdown files you can add classes and ids to inline elements like this:

This *word*{:.def} has to be defined. 
→ This word has to be defined.

You can try it with Markdownr.

But I guess the simpler and more practical way is to just add s and do the desired changes later on with a script. Just as proposed by Antoine Gersant.