An international standard for books, document type definition
, has been created by the International Standards Organization (ISO 12083) and this presents a standardized general markup language (SGML) which has been refined to Extensible Markup Language (XML).
Document Type Definition
(DTD)--A document that defines which tags and attributes can be used in a single or group of XML or SGML document(s)
Using document type definitions
(DTDs), it allows the promise of self-defining flexibility without sacrificing underlying universality.
Then the group will develop a document type definition
for using XML, which will "tell the structure of the data and the tags that identify the data," he says.
Others were developed for specialized domains, such as the Text Encoding Initiative (TEI) Guidelines for Electronic Text Encoding and Interchange, including the TEI header as a mandatory element in TEI-conformant texts; the Encoded Archival Description (EAD), an SGML document type definition
for encoding finding aids; and the Content Standards for Digital Geospatial Metadata (CSDGM) developed by the U.
Accordingly, a tool was developed to assist with SGML Document Type Definition
Our pubXML is a flexible data model, or Document Type Definition
(DTD), which can be readily configured to deliver all viable digital formats including ePub, Kindle (Amazon), mobiPocket, HTML, XHTML, PDF, BBeB (Sony), Palm, NFO (net library) and ASCII.
In 2009, MISMO first published a sweeping new set of data standards called the Version 3 Reference Model, which is based on XML schema instead of the old document type definition
Because the content was developed in a print-specific format, it must be converted to a format usable in other media: PDF (easy), HTML (less easy), or, even better, XML (difficult, depending on the document type definition
or schema that's targeted).
All the components and their respective values must conform to definitions in the language's conformance-checking mechanisms-in other words, a document type definition
HTML, though, has a fixed Document Type Definition
As a formal language construct, an SGML document can be parsed against a Document Type Definition
(DTD) that unambiguously defines what elements are allowed and where in the document they can (or must) occur.