| DirectX SDK |
The descriptions of DirectMusic files in the following sections use a subset of the conventional notation for RIFF files. The principal parts of this notation are shown in the following table:
| Notation | Description |
|---|---|
| <element> | File element labeled "element", or of type element. |
| [ <element> ] | Optional file element. |
| <element>... | One or more copies of the specified element. |
| [<element>]... | Zero or more copies of the specified element. |
| name, 'name', NAME, or 'NAME' | FOURCC identifier of a form type, list type, or chunk. |
| // Comment | Comment. |
Labels are used only in the notation, not in the files themselves. The label <cheh-ck> refers to a chunk with a unique FOURCC identifier and format. Wherever a chunk of this kind occurs in the notation, the same label is used.
The data or subelements associated with a label are described as follows:
<cheh-ck> -> cheh( <DMUS_IO_CHORDENTRY> )
This notation shows that the chunk labeled <cheh-ck> consists of the FOURCC identifier "cheh" followed by a DMUS_IO_CHORDENTRY structure. Of course, a DWORD showing the size of the data must precede the data, as it does in any RIFF chunk. The presence of this data-size element is assumed and is not shown in the notation.
The next example shows a list element, consisting of the FOURCC LIST followed by the list identifier "cmap" and one or more elements labeled <choe-list>. The <choe-list> element would be expanded elsewhere.
<cmap-list> -> LIST( 'cmap'
<choe-list>... )