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DTD - Document Type Declarations. A file that declares what elements and attributes will appear in your XML file. A DTD is a good method to test the structure of your XML to make sure it conforms to your desired structure. An XML file that conforms to the DTD declarations is considered “Valid.” DTDs are better for text-intensive applications, schemas are best used for data-intensive XML applicatons. (See Schema)

HTML - Hyper Text Markup Language. The basic language of the Web. Derived from SGML, HTML favors “design” over “content.”

Schema - Similar to a DTD, schemas declare the elements, attributes and structure of an XML file and adds the ability to validate and format data within the structure. Schemas are best used for data-intensive XML applicatons, DTDs are better for text-intensive applications. (See DTD)

SGML - Standard Generalized Markup Language. The progenitor of all markup languages, created in the 70’s to help in the transfer of data between dissimilar computer systems.

XML - eXtensible Markup Language. A markup language that differs from HTML in that it identifies data and elements over display properties.

XSL - eXtensible Stylesheet Language. A language that can be used to style an XML file for display in a Web browser.

XSLT - eXtensible Stylesheet Language. A language that can be used to transform XML into HTML, XHTML, text or even a PDF.