1 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Using XSLT and XPath to Transform XML Documents Roger L. Costello XML Technologies.

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Presentation transcript:

1 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Using XSLT and XPath to Transform XML Documents Roger L. Costello XML Technologies

2 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Note All the xsl functionality that we learned in creating XSL-enhanced HTML documents are applicable in transforming XML documents

3 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Transformation Language XSL may be used as a transformation language --> it may be used to transform an XML document into another XML document (perhaps the new one is the same, minus company sensitive data) Transformation Engine (XSL Processor) XSL XML

4 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Example: Filter Gold Members Jeff lightgrey David lightblue Roger lightyellow Jeff lightgrey Roger lightyellow

5 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. XML Transformations - all about (Template) “Rules” “Hey xsl processor, when you encounter the root element (e.g., FitnessCenter) do [action1]” “Hey xsl processor, when you encounter the Member element do [action2]” “Hey xsl processor, when you encounter the Name element do [action3]” And so forth

6 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. XML Transformations - all about (Template) “Rules” Each template rule has two parts: –A pattern or matching part, that identifies the XML node in the source document to which the action part is to be applied. Matching information is contained in an attribute. –An action part that details the transformation of the node

7 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. XSL Document Structure [action] [action] [action]...

8 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Template Rules Template rules take the following general form: [ action ]

9 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Template Rules (Example) “Hey XSL processor, as you parse through the XML document and you get to a element use this template rule.” “Go to each of my children (the Member children) and apply the template rules to them.”

10 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Terminology In FitnessCenter.xml we have (snippet): Jeff lightgrey... “Member is a child element of the FitnessCenter element. Name, Phone, Phone, and FavoriteColor are children elements of the Member element. Member is a parent of Name. FitnessCenter and Member are ancestors of Name.”

11 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. xsl:element Suppose that you are writing a stylesheet to generate an XML document. Obviously, you will need your stylesheet to output elements. –xsl:element is used to create elements [contents of the new element] [contents of the new element] creates

12 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Identity Transformation For our first example, lets create a stylesheet which simply creates an XML document that is a copy of the input XML document

13 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Document / PI Element FitnessCenter Element Member Element Member Element Member Element Name Element Phone Element Phone Element FavoriteColor... Text Jeff Text Text Text lightgrey...

14 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. <xsl:stylesheet xmlns:xsl=" version="1.0"> Cont. -->

15 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. (see xml-example01)

16 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Jeff lightgrey David lightblue Roger lightyellow Note that we've lost the attribute on the Member element

17 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. For each attribute Add an attribute to the element being output. The name of the attribute is the name of the current attribute being processed. The value of the attribute is the value of the current attribute being processed. Getting Member’s Attribute: (see xml-example02)

18 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Jeff lightgrey David lightblue Roger lightyellow

19 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Generalize Our identity stylesheet will only work for FitnessCenter XML documents. We can make a stylesheet which does an identity transformation on any XML document.

20 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. <xsl:stylesheet xmlns:xsl=" version="1.0"> (see xml-example03)

21 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Default Template Rules Every xsl document has two default template rules These rules are applied when the XSL Processor cannot find a template rule to use in your stylesheet Here are the two default template rules: “Match on the document or any element. The action is to go to the children and execute their template rules.” “Match on a text node. The action is to output the value of the text node.”

22 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Multiple Applicable Rules Suppose that the XSL Processor is processing FitnessCenter and it gets to the element. Why does it use:... and not the default template rule:... ??? After all, both apply. Answer: given two rules that apply, the more specific rule wins. --> Clearly, “*” is much more general than “Member”. “*” matches on any element. “Member” just matches on the Member element.

23 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Smallest Identity Transformation Stylesheet Now that we know about the default template rules, we can further reduce the size of the stylesheet.

24 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. <xsl:stylesheet xmlns:xsl=" version="1.0"> (see xml-example04)

25 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. The xsl:apply-templates element (without the select attribute) tells the XSL Processor to apply the template rules to all children (in document order) The xsl: apply-templates element can have a select attribute that tells the XSL Processor to process only the child element that matches “pattern”. –Thus, the select attribute rule enables us to specify the order in which the children are processed

26 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. "Go to the template rule for my Name child element. Then go to the template rule for the work Phone child element." "Go to all the child element nodes (not to any child text nodes)." Do Lab4, Part 1-4

27 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. mode Attribute Allows you to create multiple template rules for the same element. Each template rule can process the element differently. So, you can have multiple template rules for the same element. Just give each template rule a different mode

28 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Problem Identity transform the FitnessCenter.xml document. However, after you have copied all the Members, follow up with a (new) GoldMembers section, containing the name of each gold member (within stars) The next slide shows what the output XML file should look like

29 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Jeff lightgrey David lightblue Roger lightyellow ***David*** (see xml-example05) Note that the names here are processed differently than the name in the GoldMembers section

30 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. <xsl:stylesheet xmlns:xsl=" version="1.0">

31 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. *** *** Do Lab5, Part 1

32 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. Stylesheet Reuse via xsl:include and xsl:import The elements xsl:include and xsl:import enable you to reuse other stylesheets. These elements are “top-level elements”. This means that they must be immediate children of the xsl:stylesheet element (i.e., they cannot be within a template rule) The xsl:include element is basically a macro substitution - the element is replaced by the contents of stylesheet it references

33 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. <xsl:stylesheet xmlns:xsl=" version="1.0"> <xsl:stylesheet xmlns:xsl=" version="1.0"> Replace the xsl:include element with the contents of the referenced stylesheet (i.e., all the children of xsl:stylesheet) toUpperCase.xsl

34 Copyright (c) [2000]. Roger L. Costello. All Rights Reserved. xsl:import xsl:import acts just like xsl:include - the stylesheet that it references is macro-substituted. However, there is a difference: –With xsl:include the stuff that is macro-substituted into the stylesheet has the same precedence as the rest of the stylesheet. It is as though you had one stylesheet. –With xsl:import the stuff that is macro-substituted into the stylesheet has lower precedence than the rest of the stylesheet. Also, all xsl:import elements must come first in the stylesheet.