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This includes XHTML documents: Finally, the document type definition may include no subset at all; in that case, it just specifies that the document has a single top-level element (this is an implicit requirement for all valid XML and HTML documents, but not for document fragments or for all SGML documents, whose top-level elements may be different from the implied root element), and it indicates the type name of the root element: DTDs describe the structure of a class of documents via element and attribute-list declarations.
Element declarations name the allowable set of elements within the document, and specify whether and how declared elements and runs of character data may be contained within each element.
For each possible attribute, it contains: this type means characters data and indicates that the effective value of the attribute can be any textual value, unless the attribute is specified as fixed (the comments in the DTD may further document values that are effectively accepted, but the DTD syntax does not allow such precise specification);the effective value of the attribute must be a valid identifier, and it is used to define and anchor to the current element the target of references using this defined identifier (including as document fragment identifiers that may be specified at end of an URI after a "#" sign); it is an error if distinct elements in the same document are defining the same identifier; the uniqueness constraint also implies that the identifier itself carries no other semantics and that identifiers must be treated as opaque in applications; note that XML also predefines the standard pseudo-attribute "the effective value of the attribute can only be a valid identifier (or a space-separated list of such identifiers) and must be referencing the unique element defined in the document with an attribute declared with the type the effective value of the attribute can only be a valid name token (or a spaced-separated list of such name tokens), but it is not restricted to a unique identifier within the document; this name may carry supplementary and application-dependent semantics and may require additional naming constraints, but this is out of scope of the DTD;the effective value of the attribute can only be the name of an unparsed external entity (or a space-separated list of such names), which must also be declared in the document type declaration; this type is not supported in HTML parsers, but is valid in SGML and XML 1.0 or 1.1 (including XHTML and SVG);" pipe character) of notation names, where each notation name in the enumeration must also be declared in the document type declaration; this type is not supported in HTML parsers, but is valid in SGML and XML 1.0 or 1.1 (including XHTML and SVG).), or which value should be used as a default value ("…") in case the given attribute is left out in an XML tag.
Note that attribute list declarations are ignored by non-validating SGML and XML parsers (in which cases any attribute is accepted within all elements of the parsed document), but these declarations are still checked for well-formedness and validity. The entity declaration assigns it a value that is retained throughout the document.
The external subset may be referenced via a public identifier and/or a system identifier.