A set of markup declarations that define a document type for the SGML-family of markup languages (e.g., XML and HTML). Newer XML Namespace-aware schema languages (e.g., W3C XML and ISO RELAX NG) have largely superseded DTDs.
Each such syntax is called a "document type definition (DTD)." Each syntax consists of a set of generic codes ("tags") for coding a particular type of document, together with the allowable contents ("content models") and sets of attributes ("attribute lists") for each generis ("element").
Key Features at a Glance Extensibility Can convert documents and data into any valid XML Document Type Definition (DTD) pr schema Support Works with all major versions of Microsoft Word Graphical Conversion definitions can be developed, modified, Interface and debugged through a graphical user interface Throughput A single or series of conversion definitions can be run on one or more flies Other Important Excellent integration with Microsoft Word.
The cornerstone of these efforts is the project to complete the MISMO Version 3 standards--a complete rework of the current XML document type definition (DTD) transaction framework into XML schema, a more advanced architecture with significant technical enhancements over DTD.
They can also define more complex tag definitions in linked documents called DTDs (Document Type Definition), or by more complex XML schemas, which describe the structure of data and allows document designers to label distinct data elements.