As of January, 2012, this site is no longer being updated, due to work and health issues
Site Search Tools Glossary
Markup Languages and Formatting Style Sheets
- SGML - Standard Generalized Markup Language
- A markup (tagging) meta-language designed by committee and used for all
sorts of purposes, from libraries to aerospace documentation. SGML is self-describing,
with a required section that specifies the tags used in a particular document.
In theory, any SGML parser could read and display any document, but apparently
it's been so unwieldy that most parsers have been tied to a particular implementation
of the standard.
- HTML - Hyper Text Markup Language
- The vastly simplified special-purpose markup language is defined using SGML.
It is now the Internet standard for designing web pages for the world wide
web. Many tags, such as citation and
were designed for computer-science academic types.
- XML - EXtended Markup Language
- A manageable subset of SGML, this language contains all the most important
parts of its parent, without much of the complexity. It is a meta-language
for creating markup language, a data modeling language optimized for the Internet
and designed to be both simple and flexible. It works well with existing HTML
pages, yet allows pages to describe additional tags for specific types of
content. For example, an XML book review might have Author, Title, Publisher,
Price, Reviewer, Rating, Review, and other similar tags. XML tagging
will allow site search engines to treat static documents as database records,
and search them on specified fields. Webwide search engines will have a harder
time, as they will not know much about the individual tags used by each site.
- DTD - Document Type Definition
- The expression of the XML tags used for this particular page or pages. It
defines the elements, attributes and entities allowed in the page.
- DHTML - Dynamic HTML
- A larger set of tags adding layout, interactivity and data binding to HTML.
There was some contention between Netscape and Microsoft on the definition
of this standard, but it seems to be more reasonable now. The demonstrations
space of the browser, and automatically resetting font size and color. DHTML
can be expressed in XML.
- CSS - Cascading Style Sheets
- As XML describes the data content organization, CSS defines the representation
of the data, providing more detailed instructions to the parsers than plain
HTML. This will allow more precise layout and display of information.
- CSSP - Cascading Style Sheets - Positioning
- A proposed standard to allow designers to specify the position of display
elements on a page, much like a desktop publishing layout application does
for printable text. Web design applications now do this using a variety of
techniques, tricks and hacks, so this standard would let browsers and other
parsers just follow the rules to display this kind of data.
- XSL - Extended Style Sheets
- A proposed standard extending the CSS model to more complex systems, adding
style semantics for extended tags and structure.
- XLL - Extended Link Language
- A proposed standard extending the concept of hypertext link to multiple
targets, two-way linking, annotations and more.
- Rich schemas for XML, such as currency, other complex data types.
- DOM - Document Object Model
- Interface "glue" that ties the data and the scripting on the desktop, regardless
of the browser.
- A proposal, in its very early stages, to register tags, enabling DTDs to
distinguish element source, ownership, or application. This would allow webwide
search engines to recognize and specify individual fields for searching.
- RDF - Resource
- Based on the MCF work done at Apple (shown under the name HotSauce), RDF
provides metadata, information about information. It allows better navigation
within sites, agents to exchange data between sites. It's a W3C
Page Updated 2006-06-16