This module contains functions and variables to perform XSL transformations.
By default, this module uses Java’s XSLT 1.0 Xalan implementation to transform documents. XSLT 3.0 is used if the Saxon XSLT Processor is found in the class path (e.g., by placing the library files in the lib/custom directory). A specific transformer can be specified by assigning a classpath to the system property javax.xml.transform.TransformerFactory with the -D flag on the command line, or directly in Java:
System.setProperty(
"javax.xml.transform.TransformerFactory",
"org.custom.xslt.TransformerFactoryImpl");
Context ctx = new Context();
String result = new XQuery("xslt:transform('...', '...')").execute(ctx);
...
ctx.close();
Currently,
xslt:transform-report requires Saxon 10 to return results.
All functions and errors in this module are assigned to the http://basex.org/modules/xslt namespace, which is statically bound to the xslt prefix.
| Signature | xslt:processor() as xs:string |
|---|
| Summary | Returns the name of the applied XSLT processor (Java, Saxon EE, Saxon PE, Saxon HE). If a system property was assigned that points to an existing implementation other than Saxon, the classpath is returned instead. |
|---|
| Signature | xslt:version() as xs:string |
|---|
| Summary | Returns the supported XSLT version (1.0, 3.0). An empty string is returned if a classpath in the system property points to an existing implementation other than Saxon. |
|---|
| Signature | xslt:transform(
$input as item(),
$stylesheet as item(),
$arguments as map(*)? := {},
$options as map(*)? := {}
) as node() |
|---|
| Summary | Transforms the document specified by $input, using the XSLT template specified by $stylesheet, and returns the result as node. $input and $stylesheet can be specified as:
xs:string, containing the stylesheet URI,xs:string, containing the document in its string representation, ornode(), containing the document itself.
XML Catalog files will be considered when resolving URIs. Variables can be bound to a stylesheet via $arguments (only strings are supported when using XSLT 3.0 and Saxon). The following $options are available:
| option | default | description |
|---|
cache | false() |
Cache XSLT transformer; speeds up repeated transformations, but increases memory consumption.
|
|
|---|
| Errors | error | An error occurred during the transformation process. |
|
|---|
| Signature | xslt:transform-text(
$input as item(),
$stylesheet as item(),
$arguments as map(*)? := {},
$options as map(*)? := {}
) as xs:string |
|---|
| Summary | Transforms the document specified by $input, using the XSLT template specified by $stylesheet, and returns the result as string. The semantics of $params and $options is the same as for xslt:transform. |
|---|
| Errors | error | An error occurred during the transformation process. |
|
|---|
| Signature | xslt:transform-report(
$input as item(),
$stylesheet as item(),
$arguments as map(*)? := {},
$options as map(*)? := {}
) as map(*) |
|---|
| Summary | Transforms the document specified by $input, using the XSLT template specified by $stylesheet, and returns a map with the following keys:
result: The transformation result: One or more document nodes, or (if the result cannot be converted to XML) an item of type xs:untypedAtomic.messages: Requires Saxon 10: Informational output generated by xsl:message elements: A sequence of arrays. The arrays consist of XML elements, or (for those messages that cannot be converted to XML) items of type xs:untypedAtomic.
The semantics of $params and $options is the same as for xslt:transform. error (optional): An error string, which would be raised as an error by the other functions of this module.
|
|---|
Added: New function.
| Signature | xslt:init() as empty-sequence() |
|---|
| Summary | Discards the cached XSLT transformers. |
|---|
Example 1: XSL transformation, with XML and XSL supplied as nodes
Query:
(: Outputs the result as html. :)
declare option output:method 'html';
let $in :=
<books>
<book>
<title>XSLT Programmer’s Reference</title>
<author>Michael H. Kay</author>
</book>
<book>
<title>XSLT</title>
<author>Doug Tidwell</author>
<author>Simon St. Laurent</author>
<author>Robert Romano</author>
</book>
</books>
let $style :=
<xsl:stylesheet version='3.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:output method='xml'/>
<xsl:template match="/">
<html>
<body>
<xsl:for-each select='books/book'>
• <b><xsl:apply-templates select='title'/></b>: <xsl:value-of select='author'/>
</xsl:for-each>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
return xslt:transform($in, $style)
Result:
<html>
<body>
• <b>XSLT Programmer’s Reference</b>: Michael H. Kay<br>
• <b>XSLT</b>: Doug Tidwell<br>
</body>
</html>
Example 2: Textual XSL transformation
Query:
xslt:transform-text(<dummy/>, 'basic.xslt')
basic.xslt
<xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">123</xsl:template>
</xsl:stylesheet>
Result:
123
Example 3: XSL transformation with variable assignment
Query:
let $in := <dummy/>
let $style := doc('variable.xsl')
return xslt:transform($in, $style, { "v": 1 })
variable.xsl
<xsl:stylesheet version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:param name='v'/>
<xsl:template match='/'>
<v><xsl:value-of select='$v'/></v>
</xsl:template>
</xsl:stylesheet>
Result:
<v>1</v>
<v>1</v>
Example 4: XSL transformation, yielding a result and info messages
Query:
xslt:transform-report(
<_/>,
<xsl:transform version='2.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match='/'>
<xsl:message><msg>START...</msg></xsl:message>
<xml>123</xml>
<xsl:message select='4, 5, "...END"'/>
</xsl:template>
</xsl:transform>
)
Result:
{
"messages": ([<msg>START...</msg>], ["4 5 ...END"]),
"result": <xml>123</xml>
}
| Code | Description |
|---|
error | An error occurred during the transformation process. |
Version 11.0- Added:
xslt:init to discard cached XSLT transformers.
Version 9.7Version 9.2- Updated: Support for XML Catalog files added.
Version 9.0Version 7.6Version 7.3
