1. XSLT & XPATH

2. From Friday Everything in XML is machine readable Attributes describe elements, so does an element’s place in the tree (context) XML must be – Well formed (following XML syntax rules) – Valid (following the rules of the specified DTD[s])

3. Your resume should look like:

4. Question How can copyright & attribution information be maintained in mashups?

5. Using Meta Data in Decisions Or Why bother with structured markup? facilitate (re)usability by others

6. Image an Article: body creator Title Featured image?

7. HTML

8. RDFa Resource Description Framework in [xhtml] attributes

9. Down Stream Uses of Structure Currently, FB guesses at what the ‘featured’ image might be when you Post a link. Wouldn’t it be better if tumblr told FB?

10. Down Stream Uses of Structure

11. Provenance Provenance :: where something came from … wouldn’t be nice if tumblr style provenance Was inter-system

12. Question How can copyright & attribution information be maintained in mashups?

13. XSLT & XPATH XPATH = XML query language XSLT = Translate XML from one schema to another – Extensible Stylesheet Language Transformations XSLT is nothing without XPATH

14. XPATH XSLT CSS (sorta) jQuery (sorta) PHP SimpleXML

15. Get an RSS File Example: nytimes.com Click on RSS button – (see the rss being transformed into HTML by the browser) View Source

16. XPATH Selectors // selects the root element channel selects the channel element and all of its children //channel/title / moves down the tree and selects the title element

17. XPATH Selectors title/.. selects channel /. selects the current element (if you're in a loop or something)

18. XPATH Selectors (attributes) @ selects nodes attributes channel/link/@type selects the type attribute in link

19. XPATH Conditionals go in [] //channel/item[1] selects the first item [last()] [position()<15] //a[@href="http://www.rpi.edu"]

20. XPATH Operators & Comparators + - * div = >= <= or and mod | is not OR it is used to concatenate sets of elements

21. XPATH functions position() last() abs() floor() string-length() name() http://www.w3.org/TR/xpath-functions/ http://www.w3schools.com/Xpath/xpath_functio ns.asp http://www.w3schools.com/Xpath/xpath_functio ns.asp

22. XPATH Get, run, files from: – http://www.rpi.edu/~gillw3/websys/xslt/files/ http://www.rpi.edu/~gillw3/websys/xslt/files/ (inspect both, open the RSS file in your browser)

23. XSLT XSL is XML Transforms XML into XML We'll transform XML into XHTML

24. XSLT Where does XSLT happen? – server side: http://us2.php.net/manual/en/book.xsl.php – Client side: FF / Safari / IE add to the top of your xml document

25. XSLT Use XPATH to select (and display) element values XSLT value-of

26. XSLT Control Structures If Choose / when / otherwise for-each sort templates

27. XSLT if

28. XSLT Choose output output May stack many tests / conditions

29. XSLT for-each

30. XSLT Sort Datatype & order attributes: http://www.xml.com/pub/a/2002/07/03/transform.html

31. XSLT Templates Template is a container for a chunk of XSLT XPATH inside of the template starts where the match attribute ends stuff: output & control

32. XSLT Templates Templates As Functions value

33. In Class Grab this XML feed: http://events.rpi.edu/webcache/v1.0/xmlDays /3/list-xml/no--filter.xml http://events.rpi.edu/webcache/v1.0/xmlDays /3/list-xml/no--filter.xml Using XPATH and XSLT: – Print out a list of events from the feed – Put the summary in an – Put the description in a – Include a human readable start time & date