XSL Concepts Lecture 7. XML Display Options What can XSL Transformations do? generation of constant text suppression of content moving text (e.g., exchanging.

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Presentation transcript:

XSL Concepts Lecture 7

XML Display Options

What can XSL Transformations do? generation of constant text suppression of content moving text (e.g., exchanging the order of the first and last name) duplicating text (e.g., copying titles to make a table of contents) sorting more complex transformations that "compute" new information in terms of the existing information

XSLT output The output of an XSL Transformation can be any valid XML vocabulary. HTML WML Etc.

XML Stylesheet Components XPath: XML Path Language--a language for referencing specific parts of an XML document XSLT: XSL Transformations--a language for describing how to transform one XML document (represented as a tree) into another XSL: Extensible Stylesheet Language--XSLT plus a description of a set of Formatting Objects and Formatting Properties

Transformation Process

XML Stylesheet Language The stylesheet is a well-formed XML doc. <xsl:stylesheet xmlns:xsl= version=“1.0”> <xsl:transform xmlns:xsl= version=“1.0”> <daisyduck:stylesheet xmlns:daisyduck= version=“1.0”>

Why use Namespaces Transformation Document contains elements from The stylesheet language Input document (pizza, topping, etc) Output document (h1, h2,, etc)

Templates The whole element is a template The match pattern determines where this template applies Result element(s) come from non- XSL namespace(s) XSLT elements come from the XSL namespace

XPath properties Pattern matching occurs in a context; XPath expressions and XSLT elements can change the current context and consequently the nodes which match XPath is inclusive or greedy, it addresses all matching elements. You must use predicates to refine the set of nodes selected.

Pattern Examples STANZA Matches all children in the current context STANZA/LINE Matches all elements that have a parent of / Matches the root of the document STANZA//LINE Matches all elements that have an ancestor of

Pattern Examples (contd..) STANZA/LINE[1 ] Matches the first child of all the children in the current context //title Matches all elements anywhere in the document.//title Matches all elements that are descendants of the current context

Matching Rules nodetest[1] Matches the first node nodetest[position()=last()] Matches the last node nodetest[position() mod 2 = 0] Matches even nodes Matches the element(s) with id attributes whos value is "foo"