Table of topic groups > Front page of CSS-guide > Extra pages > C What conceptual schemes and term trees relate with CSS

C What conceptual schemes and term trees relate with CSS

Handled conceptual schemes and term trees

• Conceptual schemes:
  • HTML/XML comment tag
  • Element tags
• Term trees:
  • Identifiers
  • Markup codes

Conceptual shemes

HTML/XML comment tag

Element tags

Term trees

Identifiers

CSS needs identifiers in two meanings. First the browser must find target elements to the declaration-blocks. The browser needs element and rule identifiers in the relation to the main documents. These could be called as external identifiers. Second CSS needs internal identifiers in order that the CSS-parser could be able to read correctly individual style sheets. It must be able to identify properties. The browser needs internal rule and property identifiers. I have completed the term list also with terms, which are not handled in the actual explanation page of the used terms.

• element identifiers (external identifiers):
  • element type names (= generic identifiers in SGML and XML)
  • specified element type identifiers:
    • class name
    • id name (IDentification = unique identifier)
    • attribute names
    • attribute names and values
• at-rule names (internal identifiers)
• property identifiers: (internal identifiers)
  • property names
  • property keywords and units (length units, percentages, colors, angles, times ja frequencies)

W3C: CSS2: 4 CSS2 syntax and basic data types.

Markup codes

• Declarations:
  • xml-declaration
  • Document type declaration
• element tags (element markup codes):
  • start and end tags (closer above)
    • delimiters
    • element type identifier (element name = generic identifier)
• Comment tags (closer above)
• Common entities
• DATA sections:
  • PCDATA
  • CDATA
  • RCDATA

In addition the same kind of tags as xml-declarations are used also in server-side scripts, for example in PHP3 (<?php ... ?>; ASP and many other server-side scripts use instead <% ... %>).