A tag is followed by an identifier. Identifiers can contain only the characters [A-Za-z]. Each tag is made up of tags and/or declarations. A declaration consists of a property followed by a value. Around each of these there may be whitespace.

A tag block starts with a left curly brace { and ends with the matching right curly brace }. Single ' and double quotes " must also occur in matching pairs, and characters between them are parsed as a string.

The episodeDef tag is made up of mapDef tags. A sample episodeDef tag is as follows:

episodeDef escapeFromWolfenstein
{
	mapDef e1m1
	{
		filename	"w00.map"
		nextlevel	e1m2
		secretlevel	e1m10
		floor-number	0
	}
}