Crazy XML study notes (11) -----------XSLT explanation
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Release： 2017-02-21 14:44:50
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XSLT It starts from XSL and ends with XSLT, XPath and XSL-FO.
XPath will be explained in detail later
Start with XSL
XSL refers to the Extended Stylesheet Language (EXtensible Stylesheet Language).
The World Wide Web Consortium (W3C) started developing XSL because there was a need for an XML-based stylesheet language.
CSS = HTML style sheet
HTML uses predefined tags, and the meaning of the tagsis easy to understand.
The
element in the HTML element defines a table - and the browser knows how to display it.
Adding styles to HTML elements is easy. With CSS, it's easy to tell the browser to display an element with a specific font or color.
The meaning
is not always easy to understand
. The
element means an HTML table, a piece of furniture, or something else - the browser doesn't know how to display it.
XSL can describehow to display XML documents!
XSL - More than just a stylesheet languageXSL consists of three parts:
XSLT
A language for transforming XML documents.
XPath
A language for navigating in XML documents.
XSL-FO
A language for formatting XML documents.
XSLT is a method used to convert XML documents into XHTML documents or other XML documents language.
XPath is a language for navigating in XML documents.
Basic knowledge you need to have before studying:
Before you continue studying, you need to have a basic understanding of the following knowledge Learn about:
HTML / XHTML
XML / XML namespace
XPath
If you would like to learn about these projects first, please contact us
Home page to access these tutorials.
What is XSLT?
XSLT refers to XSL Transformations.
XSLT is the most important part of XSL.
XSLT can transform one XML document into another.
XSLT uses XPath to navigate within XML documents.
XPath is a W3C standard.
XSLT = XSL Transformation
XSLT is the most important part of XSL.
XSLT is used to convert one XML document into another XML document, or other types of documents that can be recognized by browsers, such as HTML and XHTML. Typically, XSLT does this by converting each XML element into an (X)HTML element.
With XSLT, you can add or remove elements and attributes to or from the output file. You can also rearrange elements, perform tests and decide which elements to hide or show, and more.
A common way of describing the transformation process is that
XSLT transforms an XML source tree into an XML result tree
.
XSLT uses XPath
XSLT uses XPath to find information in XML documents. XPath is used to navigate within XML documents through elements and attributes.
If you would like to learn XPath first, please visit our
XPath Tutorial.
How does it work?
During the transformation process, XSLT uses XPath to define portions of the source document that match one or more predefined templates. Once a match is found, XSLT transforms the matching portion of the source document into the result document.
Correct style sheet declaration
Declare the document as XSL The root element of the style sheet is or .
Note: and are completely synonymous and can be used!
According to the W3C's XSLT standard, the correct way to declare an XSL style sheet is:
Apply template rules from the imported style sheet.
6.0
apply-templates
Apply a template to the current element or a child element of the current element.
5.0
6.0
attribute
Add an attribute to an element.
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attribute-set
Create a named attribute set.
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call-template
Call a specified template.
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choose
Used in conjunction with and to express multiple conditions test.
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comment
Create a comment node in the result tree.
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copy
Create a backup of the current node (without child nodes and attributes).
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copy-of
Create a backup of the current node (with child nodes and attributes).
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decimal-format
Definition When a number is converted to a string through the format-number() function characters and symbols to be used.
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element
Create an element node in the output document.
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fallback
Specifies a fallback code to run if the processor does not support an XSLT element.
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for-each
Traverse each node in the specified node set.
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if
Contains a template that is applied only when a specified condition is true.
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import
is used to pour the contents of one style sheet into another style sheet.
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include
Include the contents of one style sheet into another style sheet.
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key
Declare a named key.
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message
Write a message to the output (for error reporting).
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namespace-alias
Replace the namespace in the stylesheet with a different namespace in the output .
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number
Determine the integer position of the current node and format the number.
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otherwise
Specifies the default action of the element.
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output
Define the format of the output document.
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param
Declare a local or global parameter.
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preserve-space
is used to define elements that retain whitespace.
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processing-instruction
Generate processing instruction node.
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sort
Sort the results.
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strip-space
Defines elements from which whitespace characters should be removed.
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stylesheet
Define the root element of the style sheet.
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template
The rule to apply when the specified node is matched.
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text
Generate text nodes through style sheets.
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transform
Define the root element of the style sheet.
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value-of
Extract the value of the selected node.
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variable
Declare local or global variables.
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when
Specifies the action of the element.
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with-param
Specifies the value of the parameter that needs to be passed into a template.
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