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# xml_set_notation_decl_handler

xml_set_notation_decl_handler -- set up notation declaration handler

## Description

`int xml_set_notation_decl_handler` (int parser, string handler);

Sets the notation declaration handler function for the XML parser `parser`. `handler` is a string containing the name of a function that must exist when xml_parse() is called for `parser`.

A notation declaration is part of the document's DTD and has the following format:

    <!NOTATION
         name {systemId |
         publicId}>

See section 4.7 of the XML 1.0 spec for the definition of notation declarations.

The function named by `handler` must accept five parameters:

``handler``(int parser, string notationName, string base, string systemId, string publicId);

`parser`

  The first parameter, `parser`, is a reference to the XML parser calling the handler.

`notationName`

  This is the notation's `name`, as per the notation format described above.

`base`

  This is the base for resolving the system identifier (`systemId`) of the notation declaration. Currently this parameter will always be set to an empty string.

`systemId`

  System identifier of the external notation declaration.

`publicId`

  Public identifier of the external notation declaration.

If a handler function is set to an empty string, or `false`, the handler in question is disabled.

True is returned if the handler is set up, false if `parser` is not a parser.

There is currently no support for object/method handlers.

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