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This document is parsed as if it was: Note that reference to the "author" internal entity is not substituted in the replacement text of the "signature" internal entity.
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.
A common use is to have a name more recognizable than a numeric character reference for an unfamiliar character.
Note that internal entities may be defined in any order, as long as they are not referenced and parsed in the DTD or in the body of the document, in their order of parsing: it is valid to include a reference to a still undefined entity within the content of a parsed entity, but it is invalid to include anywhere else any named entity reference before this entity has been fully defined, including all other internal entities referenced in its defined content (this also prevents circular or recursive definitions of internal entities).
A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML).
A Document Type Definition (DTD) defines the legal building blocks of an XML document.
Programs for reading documents may not be required to read the external subset.
A namespace-aware version of DTDs is being developed as Part 9 of ISO DSDL.
DTDs persist in applications that need special publishing characters, such as the XML and HTML Character Entity References, which derive from larger sets defined as part of the ISO SGML standard effort.
The declarations in the internal subset form part of the DOCTYPE in the document itself.
The declarations in the external subset are located in a separate text file.