Transforming XML Documents ith XSLT with XSLT - brics
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Transforming XML Documents ith XSLT with XSLT - brics
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An Introduction to XML and Web Technologies
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Presenting a Business Card http://businesscard.org > John Doe CEO, Widget Inc. [email protected] (202) 555-1414 i " id t if"/
An Introduction to XML and Web Technologies
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Using CSS card name title email phone
{ { { { {
background-color: #cccccc; border: none; width: 300;} display: block; font-size: 20pt; margin-left: 0; } display: block; margin-left: 20pt;} p y block; font-family: y monospace; p margin-left: g 20pt;} p display: display: block; margin-left: 20pt;}
the information cannot be rearranged information encoded in attributes cannot be exploited additional structure cannot be introduced
An Introduction to XML and Web Technologies
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Using XSLT John Doe CEO, Widget Inc. [email protected] (202) h (202) 555 555-1414 1414 / h
An Introduction to XML and Web Technologies
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XSLT for Business Cards (1/2) l "htt // 3 /1999/ ht l"
An Introduction to XML and Web Technologies
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XSLT for Business Cards (2/2) Phone:
d / l if
An Introduction to XML and Web Technologies
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XSL--FO XSL XSLT was originally design to target XSL-FO XSL-FO (Formatting Objects) in an XML language for describing physical layout of texts Widely used in the graphics industry Not supported by any browsers yet
An Introduction to XML and Web Technologies
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XSL--FO for Business Cards XSL f l name= xsl region body > l "b "/
An Introduction to XML and Web Technologies
/fo:block
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Overview
IIntroduction d i Templates and pattern matching Sequence constructors Using XSLT
An Introduction to XML and Web Technologies
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XSLT Stylesheets ...
XSLT is a domain-specific language for writing XML transformations (compare with e.g. JDOM) An XSLT stylesheet contains template rules Processing starts at the root node of the input document An Introduction to XML and Web Technologies
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Template Rules ...
Find the template rules that match the context node Select the most specific one Evaluate the body (a sequence constructor)
An Introduction to XML and Web Technologies
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Use of XPath in XSLT
Specifying patterns for template rules Selecting nodes for processing Computing boolean conditions Generating text contents for the output document
An Introduction to XML and Web Technologies
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Evaluation Context A context item (a node in the source tree or an atomic value) A context position and size A set of variable bindings (mapping variable names to values)) A function library (including those from XPath) A sett off namespace declarations d l ti
An Introduction to XML and Web Technologies
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The Initial Context The context item is the document root The context position and size both have value 1 The set of variable bindings contains only global parameters The function library is the default one The namespace declarations are those defined in th roott element the l t off the th stylesheet t l h t
An Introduction to XML and Web Technologies
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Patterns and Matching A pattern is a restricted XPath expression • it is a union of path expressions • each path expression contains a number of steps separated by / or // • each step may only use the child or attribute axis
A pattern matches a node if • starting g from some node in the tree: • the given node is contained in the resulting sequence rcp:recipe/rcp:ingredient//rcp:preparation An Introduction to XML and Web Technologies
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Names, Modes, Priorities Templates may have other attributes name: used to call templates like function mode: used to restrict the candidate templates priority: used to determine specificity
An Introduction to XML and Web Technologies
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Overview
IIntroduction d i Templates and pattern matching Sequence constructors Using XSLT
An Introduction to XML and Web Technologies
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Sequence Constructors
Element and attribute constructors Text constructors Copying nodes Recursive application Repetitions Conditionals Template invocation …
An Introduction to XML and Web Technologies
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Literal Constructors Hello World Hello b H ll World W ld /b An Introduction to XML and Web Technologies
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Explicit Constructors / > title > Hello World b > Hello World An Introduction to XML and Web Technologies
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Computed Attributes Values (1/2) / > title > Hello World b > Hello World An Introduction to XML and Web Technologies
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Computed Attribute Values (2/2) Hello World Hello b H ll World W ld /b An Introduction to XML and Web Technologies
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Text Constructors Literal text becomes character data in the output here is some chardata
Whitespace control requires a constructor:
The (atomized) value of an XPath expression:
An Introduction to XML and Web Technologies
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Recursive Application The apply-templates element • finds some nodes using the select attribute • applies the entire stylesheet to those nodes • concatenates the resulting sequences
The default select value is child::node() Processing is often (but not necessarily!) a simple recursive traversal down the input XML tree
An Introduction to XML and Web Technologies
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Student Data 100026 > number(1)"> number(@amount)>number(1) > s of sl te t / sl te t / l h An Introduction to XML and Web Technologies
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XSLT for Recipes (4/6)
An Introduction to XML and Web Technologies
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XSLT for Recipes (5/6) rcp:preparation >
An Introduction to XML and Web Technologies
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XSLT for Recipes (6/6)
y
Calories
Fat
Carbohydrates
Protein
Alcohol
g g select="@calories"/> / /
p / /
rcp:recipe > An Introduction to XML and Web Technologies
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The Output
An Introduction to XML and Web Technologies
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A Further Stylesheet Nutrition Table
Dish
Calories
Fat
Carbohydrates
Protein
/ l t l t
@calories />
/ s te p ate
An Introduction to XML and Web Technologies
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The Final Output
An Introduction to XML and Web Technologies
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Other Language Features
Variables and parameters Numbering Functions Sequence types Multiple input/output documents Dividing a stylesheet into several files Stylesheets that generate stylesheets as output
– see the book! An Introduction to XML and Web Technologies
