About

Notations identify by name

• the format of unparsed entities,
• the format of elements which bear a notation attribute,
• or the application to which a processing instruction is addressed.

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Declaration

Notation declarations provide a name:

• for the notation,
• for use in entity
• and attribute-list declarations
• and in attribute specifications,
• and an external identifier for the notation which may allow an XML processor or its client application to locate a helper application capable of processing data in the given notation.