XQL Overview (State W3C QL 98)

• Basic Concept: Selection of Subtrees

  • Originated as QL for DOM
  • adopted for selectors in XSL-templates(now merged with XPointer to XPel to XPath to ????)
  • Defined along search contexts = an (ordered) set of document nodes

• Path Expressions and Filters:

  • A query is essentially a navigation in element trees
  • Navigation and filters modify the search context
  • Query result is the last search context

• Selection of nodes by:

  • Element- and attribute name
  • Type (element, attribute, comment, etc.)
  • Content or value of nodes
  • Relationship between nodes: hierarchy, sequence, index

• Combination by: union, intersection

Previous slide

Next slide

Back to first slide

View graphic version