Processing
Plain text has an implicit structure that is usually easy to see. Markup languages exist to make that structure explicit.
Invisible Markup takes a textual document, plus a description of its format, and produces a document with explicit structure
The description is a context-free grammar, decorated with optional details about serialisation
The system uses the description to parse the textual document, and then serialises the resulting parse-tree.
17 April 2025
Describe the format:
date: day, " ", month, " ", year. day: digit, digit?. month: "January"; "February"; ...; "December". year: digit, digit, digit, digit. digit: ["0"-"9"].
17 April 2025
Describe the format:
date: day, " ", month, " ", year. day: digit, digit?. month: "January"; "February"; ...; "December". year: digit, digit, digit, digit. digit: ["0"-"9"].
Process the input with this description, and get:
<date>
<day>
<digit>1</digit>
<digit>7</digit>
</day>
<month>April</month>
<year>
<digit>2</digit>
<digit>0</digit>
<digit>2</digit>
<digit>5</digit>
</year>
</date>
17 April 2025
Describe the format:
date: day, " ", month, " ", year. day: digit, digit?. month: "January"; "February"; ...; "December". year: digit, digit, digit, digit. -digit: ["0"-"9"].
Process the input with this description, and get:
<date> <day>17</day> <month>April</month> <year>2025</year> </date>
- only serialise children
+ insert into output
@ serialise as attribute
Stable specification
Six implementations, more in development
Working group
Tutorials