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A document type definition (DTD) is a specification file that contains set of markup declarations that define a document type for an SGML-family markup language (GML, SGML, XML, HTML). The DTD specification file can be used to validate documents. A DTD defines the valid building blocks of an XML document.
A document type declaration, or DOCTYPE, is an instruction that associates a particular XML or SGML document (for example, a web page) with a document type definition (DTD) (for example, the formal definition of a particular version of HTML 2.0 - 4.0). [1]
The entity must either be predefined (built into the markup language), or otherwise explicitly declared in a Document Type Definition (DTD) (see [a]). The format is the same as for any entity reference: &name; where name is the case-sensitive name of the entity.
An SGML document may be composed from many entities (discrete pieces of text). In SGML, the entities and element types used in the document may be specified with a DTD, the different character sets, features, delimiter sets, and keywords are specified in the SGML Declaration to create the concrete syntax of the document.
An FPI consists of an owner identifier, followed by a double slash (//), followed by a text identifier. [1]: 381–382 For example, the identifier "-//W3C//DTD HTML 4.01//EN" can be broken down into two parts: the owner identifier which indicates the issuer of the FPI, and the text identifier which indicates the particular document or object the FPI identifies. [2]
The process of checking to see if a XML document conforms to a schema is called validation, which is separate from XML's core concept of syntactic well-formedness.All XML documents must be well-formed, but it is not required that a document be valid unless the XML parser is "validating", in which case the document is also checked for conformance with its associated schema.
ISO 12083 is an international SGML standard for document interchange between authors and publishers. It features separate Document Type Definitions for books, serials, articles, and math. Derived from AAP DTD, it was first published in 1993, revised in 1994, and last confirmed in 2016.
XML documents typically refer to external entities, for example the public and/or system ID for the Document Type Definition.These external relationships are expressed using URIs, typically as URLs.