markup syntax.txt

# Predefined classes

<INTEGER> ::= a number
<7-BIT>   ::= a number, 0-127 inclusive



# Document specification (entry point)

<document> ::= <header-chunk> <track-chunks>



# Header specification

<header-chunk> ::= <HEADER-ID>: <HEADER-SPEC>

<HEADER-SPEC>  ::= <format> <ntrks> <division>

<format>       ::= <FORMAT-ID>: <FORMAT-SPEC>
<FORMAT-SPEC>  ::= sing | mult | seq

<ntrks>        ::= <NTRKS-ID>: <NTRKS-SPEC>
<NTRKS-SPEC>   ::= <7-BIT>

<division>     ::= <DIV-ID>: <DIV-SPEC>
<DIV-SPEC>     ::= <7-BIT>



# Track specification

<track-chunks> ::= <track-chunk> <track-chunks> | null

<track-chunk> ::= <TRACK-ID>: <INIT-EVENT> <EVENTS> <META-EOT> (?)

<INIT-EVENT>  ::= <ZERO-DT> <EVENT-SPEC>
<EVENTS>      ::= <event> <EVENTS> | null


<ZERO-DT>     ::= <TICK-ID>: 0
<delta-time>  ::= <TICK-ID>: <INTEGER> 
    # delta time refers to length of previous event.



# Additional types

<ID>           ::= <string> | <ID> . <ID>



# Keywords

<HEADER-ID>    ::= header
<FORMAT-ID>    ::= format
<NTRKS-ID>     ::= tracks
<DIV-ID>       ::= division
<TRACK-ID>     ::= track
<TICK-ID>      ::= ticks