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I thought I understood DTD notation. However, the explain dtd contains glyphs that I have not seen before. The first is the " - - " after the element name and before the content model, as in: <!ELEMENT explain - - (serverInfo, databaseInfo?, metaInfo?, indexInfo?, (recordInfo|schemaInfo)?, initInfo?)> And, although I know what EMPTY means, I did not understand the " - 0 " in: <!ELEMENT supports - O EMPTY> These two glyphs imply that " 0 - " and " 0 0 " might also be glyphs. Can someone give me an on-line reference that explains this notation? Mark