What is the difference and relation between "Page description language", "markup language" and "Page description markup language"?
Based on their wiki webpages, I just don't understand what is their difference. Why needs there be a markup adaption of the Page description language - "Page description markup language"?
Examples: PostScript is a page description language. Is it a markup language? HTML and Latex are markup language. Are they page description language?
You can think of a page description language as something like a Word file: it's got blobs of text and an idea of where to put them. A markup language is just a listing of data that provides some type of context. A good example of a markup language is HTML: it gives context to the text that you put in it, but the layout is largely variable. You're basically just telling HTML what your data should look like; you're not fine-tuning it to what it should look like exactly (that's what CSS is for).