But the XSLT language has such a different syntax and processing model from classical programming languages that it takes time to grasp all of XSLT's subtle nuances. This article is in no way meant as an extensive and complex XSLT tutorial.
Some XSLT processors offer a special extension function to allow the resetting of variables. XSLT variables actually have a lot more in common with constants in many programming languages and are used for a similar purpose. Then, if you need to change the value when re-using the stylesheet, you only change the value assigned in the creation of that variable.
The solution is to use a variable to represent this size value: To do this, put the variable inside curly braces to make it an attribute value template. The value of the select attribute must be an expression. This offers two nice advantages: It shows that the xsl: That value of "8" is added to 2 and concatenated to "pt" to create a value of "10pt" for the bodyTextSize variable, which can then be used just like the bodyTextSize variable in the previous example.
It also demonstrates another nice feature of variables: If the XSLT processor had treated these number as strings, putting "8" and "2" together would get us "82". It can treat a variable as any type of object that can be returned by an XSLT expression: If an XSLT variable has a value assigned by an xsl: The examples above show "top-level" variables.
Variables can be "local" as well -- that is, defined inside of a template rule and only available for use within that template rule.
Instead of one global bodyTextSize variable to use throughout the stylesheet, the two template rules each have their own bodyTextSize variables declared between their xsl: The second template sets bodyTextSize to "12pt", so the winery and grape element contents copied to the result tree by that template start with font tags that have a size value of "12pt": The next stylesheet uses a selection of the string manipulation functions available in XSLT to right align the result tree versions of the color elements in this document.
The value-length variable stores the length of the color name using the string-length function. The padding variable stores the number of spaces required to right-align the color name.
It does this by subtracting the value of the local valueLength variable from the global fieldWidth variable. In the result, "red" has nine spaces before it, "blue" has eight, and "yellow" has six: As with any programming language, using local variables made it easier to break down the problem into pieces and to make the relationship of those pieces easier to understand.
All the stylesheet examples up to this point would work the same way if you substituted xsl: Here is how it looks as a complete stylesheet: Compare this with xq To pass the new value of "8pt" to the stylesheet when using the Saxon XSLT processor, the command line might look like this: When really using Saxon or any other Java-based XSLT processor, it makes your life easier to store everything before the "xq Then you can pass it the important parameters each time you run it with no need to type the full Java library names for the XSLT processor and XML parser.
The only difference between applying the xq Other XSLT processors may require a different syntax when passing a new parameter value along from the command line, but they would still create the same result when using this stylesheet and input.With XPath knowledge you will be able to take great advantage of your XSLT knowledge.
XPath is a W3C Recommendation XPath became a W3C Recommendation on November 16, XSLT Introduction XSL Languages XSLT Transform XSLT XSLT value-of> XSLT XSLT XSLT XSLT XSLT Apply XSLT on the Client XSLT on the Server XSLT Edit XML XSLT Examples. Dec 01, · Basically calling an attribute returns the whole attribute's value (it retrieves everything between the quotes).
I recommand you try to check if the xpath expression in your "xsl:valueof" tag retrieves the attribute value from the right element. DOM Node Types DOM Node DOM NodeList DOM NamedNodeMap DOM Document DOM Element DOM Attribute DOM Text DOM CDATA DOM Comment DOM XMLHttpRequest DOM Parser XSLT Elements XSLT/XPath Functions XSLT xsl:value-of>.
So (with XSLT ) you can simply write a sequence of the attributes in the order you want e.g.
will process the attributes in that order. XSLT doesn't have sequences, only node-sets. Expression: Result: Number: False if the number's value is zero or NaN (N ot a N umber)Node set: False if empty, true if the set contains at least one node xsl:if test="not(any-xml-node)">.