When processing a reference to an external entity other than a data or subdocument entity, the SGML parser must process the replacement text of the entity. If the external identifier in the declaration of such an entity contains a public identifier but no system identifier, OmniMark must be told how to locate the replacement text. The library declaration performs this function.

library declarations can also be used by OmniMark in a "library" file specified on the command line by using the "-library" control argument. A library file can be used either while an OmniMark program is being run or while a DTD is being compiled. It gives public/system identifier bindings that are only used during that run.

For example, if a DTD is being compiled with the OmniMark program on one computer, and if the result will be used on another computer (that may have a different directory structure), it is usually appropriate to put the machine-specific LIBRARY file declaration in library files during each of the runs.

This example of a library declaration could be used to locate the entity sets for alphabetic characters defined in Annex D of ISO 8879.

  LIBRARY "ISO 8879-1986//ENTITIES Added Latin 1//EN"
               "iso-lat1.gml"
          "ISO 8879-1986//ENTITIES Added Latin 2//EN"
               "iso-lat2.gml"
          "ISO 8879-1986//ENTITIES Greek Letters//EN"
               "iso-grk1.gml"
          "ISO 8879-1986//ENTITIES Monotoniko Greek//EN"
               "iso-grk2.gml"
          "ISO 8879-1986//ENTITIES Russian Cyrillic//EN"
               "iso-cyr1.gml"
          "ISO 8879-1986//ENTITIES Non-Russian Cyrillic//EN"
               "iso-cyr2.gml"

Prerequisite Concepts    Library rules and the library path

Related Syntax    library

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