/Docs/S/About/Tech/HW/1.md
  Source views: Source JSON(ish) on GitHub (VSCode)   Doc views: Document (&k=Note): Visual Print Technical: OpenParameters Xray

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This shows the mechanics of expansion:

• Clicking on "Document" launches a parser.
• The parser looks for a line that begins "r00t=".
• It takes the right hand part (the part after the "=", e.g., "Hello World"), and treats that as the text of Document.
• It looks for any "variables" - strings of text bracketed by braces ("{" followed by a "}"). If there are any variables, it "expands" them by looking for a key with a matching name. If it finds a key that matches, it makes the substitution.
• It repeats until all variables have been substituted or been found not to have matching keys.
• In the Document view, it returns the text of Document with each substitution marked with the name of the variable (do a mouse-over) and each unmatched variable highlighted in red.

Next demo is how to include another file to access its key/values.