zlacker

>>Jeanne+(OP)
Your HTML already has semantic meta elements like author and description you should be populating with info like that: https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduc...

>>qbasic+Ol
How do I add a semantic definition in an HTML tag to a JPEG, or MP4, or WAV, or any non HTML format? HTML tags fix HTML, not other formats.

>>burnte+O51
What would the difference in semantic notation between an unstructured "ai.txt" and the "alt" attribute actually be? If you want the tags to be served with the context outside of HTML, you can always use HTML header attributes.