Dynamic Markup Generation Through the Use of Static XML

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xml document, xml schema, xml documents, markup language, dynamic content, markup languages, extensible markup language, the user, static and dynamic, how to, xsl stylesheet, xml index, jsp technology, dynamic web, xml schemas

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posted:: 2/9/2010
language:: English
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							  Dynamic Markup
Generation Through the
  Use of Static XML
 Document Templates

      Joseph Longo
Classical Three Tier Model

  1st Tier             2nd Tier            3rd Tier


    Client             Webserver          Data Store
  (Browser)            (Generator)   (Relational Database)




              TCP/IP
Contemporary n -Tier Model

                 Internet      Internet
                Resource      Resource




     Client    Service Code    Internet
   (Browser)    (Generator)   Resource
Dynamic Markup generators
 CGI Common Gateway Interface
 ASP Active Server Pages
 Java Servlets
 JSP Java Server Pages
Target Markup Languages
 VoxML Voice eXtensible Markup Language
 WML Wireless Markup Language
 HTML Hypertext Markup Language
Problems with dynamic
generation
 Very difficult to determine what the target
 markup will look like once the generator
 runs
 No uniform way to generate markup
 No mechanize to ensure that the generated
 markup is valid
XML Templates Solution
 Create template markup languages (1 for
 each target language) TML.
 Use a validating XML parser to process the
 templates.
 Generate the dynamic markup by affixing
 meaning to the TML elements (semantics).
TML Processing
 Java Servlets generator
 IBM’s XML4J Validating Parser
 Java Web Server
XML Template features
 valid XML documents
 Based on the DTD for the target langauge
 TML tags are namespace protected
TML Tags (example markup)
Variable Substitution:

<html>
Hello <tml:var name=“user”/> how are you?
</html>
TML Tags continued
Conditional:

<tml:if var=“age” cond=“GT” val=“17”>
   markup for true case
<tml:else/>
   markup for false case
</tml:if>
Tag Processing Options
 DOM Document Object Model
 SAX Simple API for XML
 ElementHandler XML4J proprietary

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