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A system identifier usually points to a specific set of declarations in a resolvable location.

SGML allows mapping public identifiers to system identifiers in catalogs that are optionally available to the URI resolvers used by document parsing software.

A DTD can be declared inline inside an XML document, or as an external reference., newer XML namespace-aware schema languages (such as W3C XML Schema and ISO RELAX NG) have largely superseded DTDs.

A namespace-aware version of DTDs is being developed as Part 9 of ISO DSDL.

For example, notations may be used to reference non-XML data in an XML 1.1 document.

For example, to annotate SVG images to associate them with a specific renderer: This declares the MIME type of external images with this type, and associates it with a notation name "type-image-svg".

An attribute list specifies for a given element type the list of all possible attribute associated with that type.

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The following example of a DOCTYPE contains both public and system identifiers: The system identifiers of these DTDs, if present in the DOCTYPE, are URI references.

Instead, it is replaced only when the "signature" entity reference is parsed within the content of the "sgml" element, but only by validating parsers (non-validating parsers do not substitute entity references occurring within contents of element or within attribute values, in the body of the document.

This is possible because the replacement text specified in the internal entity definitions permits a distinction between parameter entity references (that are introduced by the "%" character and whose replacement applies to the parsed DTD contents) and general entity references (that are introduced by the "&" character and whose replacement is delayed until they are effectively parsed and validated).

A valid XML document contains only elements that are defined in the DTD.

Various keywords and characters specify an element’s content: Note that element type declarations are ignored by non-validating SGML and XML parsers (in which cases, any elements are accepted in any order, and in any number of occurrences in the parsed document), but these declarations are still checked for form and validity.

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