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DTD in more details / 2

External identifier can be either

  • PUBLIC "PUBLIC ID" "URI" (suitable for "public", generally recognized DTDs) or

  • SYSTEM "URI" - for private- or other not-that-well established DTDs ("URI" neednot be just real URL on network, may also be a file on (local) filesystem, resolution according to system where it is resolved)

The significancy of internal a external parts is the same (they must not be in conflict - eg. two defeinitions of the same element).

DTD contains a list of definitions for individual elements, list of attributes of them, entities, notations

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