Free text for any purpose. The primary purpose is to encapsulate foreign material and describe it with attributes (not for authors to write semantically void text!). Various NOTATIONs are described (if you know what to do with them). The contents should NOT include any characters of the sort < / [A-Z] in that order, or the SGML parser will think it's hit and end-tag (ETAGO). It's up to the applications whether they uuencode binary files. If so, it may be worth replacing < with, say, <
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