The Lumber Mill - XSLT For Your Templates
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The presenters discussed using the XML stylesheet language XSLT to build templates, highlighting benefits like standardized syntax, free and commercial tools, and the ability to transform XML data into HTML or other formats. They covered various XSLT concepts like templates, applying templates to nodes, importing templates, and caching output for performance. The presentation also compared XSLT to other template systems like PHP and Smarty.
![Nodes
● texts/text[@ident='foo']/*
● texts/text[@ident='foo']/text()
● texts/text[@ident='foo']/node()
● texts/text[@ident='foo']/@value
Elements Text nodes Attributes
* text() @*
node()](https://image.slidesharecdn.com/thelumbermillxsltforyourtemplatesfroscon-12509464282575-phpapp01/85/The-Lumber-Mill-XSLT-For-Your-Templates-7-320.jpg)
The Lumber Mill - XSLT For Your Templates
- 1. FrOSCon Bastian Feder, Thomas Weinert "The Lumber Mill" Using XSLT For Your Templates
- 2. About Us ● Application Developer – PHP – XSLT/XPath – (some) JavaScript ● papaya CMS – PHP based Content Management System – uses XSLT for Templates
- 3. About You ● Who are you? ● Do you use XSLT? ● How often do you use XSLT? ● Do you use other template systems/languages? ● Smarty? ● TypoScript? ● ...?
- 4. Template Systems ● Bind variables ● Layout logic – Placeholders – Conditions – Loops – Callbacks ● Formatting ● Data loading
- 5. XSL ● XML – Semantic variable tree ● XPath – Query language for XML trees ● XSLT – Transforming XML ● Conditions ● Loops ● …
- 6. Comparison ● PHP based ● XSLT – Individual syntax – Standardized – Individual tools syntax – Individual – Free and documentation commercial tools – Different flavors – Documentation of for different the standard and purpose the implementations – Easy Syntax? – One to rule them all
- 7. Nodes ● texts/text[@ident='foo']/* ● texts/text[@ident='foo']/text() ● texts/text[@ident='foo']/node() ● texts/text[@ident='foo']/@value Elements Text nodes Attributes * text() @* node()
- 8. Template call/apply ● <xsl:call-template/> – Call templates by name ● <xsl:apply-templates/> – Template matching – Most exact pattern wins ● Current node ● Parameters ● Modes
- 9. Static Templates Files ● Template files should not be writable by the web server – Security – Tools ● Template files should not be generated from PHP – Same reasons – Context
- 10. Collecting Output Page (HTML) Page (XML) Part 1 (HTML) Part 2 (HTML) Main (XML) Part 1 (XML) Part 2 (XML)
- 11. Caching Output Page (HTML) Page (XML) Cache Part 1 (HTML) Part 2 (HTML) Main (XML) Part 1 (XML) Part 2 (XML)
- 12. Embedding Output ● Escaping and CDATA-Sections – CDATA is for readability and whitespaces ● <xsl:copy-of select=“...“/> ● disable-output-escaping=“yes“ ● Dangers – HTML Injection
- 13. Import templates ● Generic ● Reusable ● Encapsulation ● Inheritance
- 14. Multiple Columns Template ● Group items – Calculate positions ● Call item group templates ● Call item generic template ● Use itemType parameter to identify item template ● Call type specific template for item
- 15. XML Data Files ● Wellformed XML ● XPath: document() ● URI – Single loading
- 16. Language Templates ● Phrases – "layout texts" ● Numbers ● Date and Time
- 17. EXSLT ● Community initiative to provide extensions to XSLT – Common – Functions – Math, Random – Strings, Regular Expressions – Dates and Times – Sets – Dynamic
- 18. EXSLT: functions module ● Make templates to functions – func:function – func:result ● Namespace required – func – Own
- 19. PHP ● Streamwrapper – return XML data for document() ● Callbacks – call php source
- 20. Streamwrapper ● PHP file functions use stream wrappers – Internal: http, ftp, phar, … ● Register own stream wrappers – PHP class – Basic functions ● stream_open(), stream_read(), stream_tell(), stream_seek(), stream_eof(), – url_stat() ● No php source!
- 21. Callbacks ● Register PHP functions for xsl – registerPHPFunctions($restrict) – php::function('function', parameter, ...) – php::functionString('function', ...)
- 22. RTF Problem ● Result Tree Fragment – XML created in XSL – No CDATA – No node set ● XSLT 2.0 ● EXSLT – node-set()
- 23. Other Templates ● Repeat String ● JavaScript Escaping
- 24. ext/xslcache ● Process cache ● Performance increase ● Still evaluating – Only some checks in php requests ● Only static XSLT ● Same library like ext/xsl – eXSLT – PHP callbacks
- 25. Administration ● Single template ● About 25% saved
- 26. Output ● Several template ● About 90% saved
- 27. Links ● http://www.a-basketful-of-papayas.net/ ● http://www.w3.org/TR/xpath ● http://www.w3.org/TR/xslt ● http://www.dpawson.co.uk/xsl/sect2/sect21.html ● http://code.nytimes.com/projects/xslcache/