The version attribute in stylesheet is required, along with its value of 1. We're only dealing with version 1. The attribute xmlns on stylesheet is a special attribute for declaring a namespace. An XSLT stylesheet must always have such a namespace declaration in order for it to work. XSLT stylesheets usually use the xsl prefix , as in xsl:stylesheet , but I am setting the prefix aside for simplicity at the moment. You'll want to use xsl when your stylesheets get only slightly more complex.
The stylesheet element is followed by the output element which is optional. The value text for the method attribute signals that you want the output of the stylesheet to just be plain text:.
Two other possible values for method in XSLT 1. The output element actually has ten attributes, all of which are optional. The next element in msg. This element is at the heart of what XSLT does. A template rule consists of two parts: a pattern, such as an XML element in the source document that you're trying to match, and a sequence of instructions.
The match attribute of template contains a pattern, a location path in XPath. The pattern in this example is the name of the msg element:. XPath syntax always appears in attribute values, as in the value of match.
The sequence of instructions sometimes called a sequence constructor contains only the literal text Found it! Sequence instructions tells an XSLT processor what you want to have happen when the pattern is found in the source. Using this stylesheet, when msg is found in the source by an XSLT processor, it will output the text Found it! It also adds:. Styling requires a source XML documents, containing the information that the style sheet will display and the style sheet itself which describes how to display a document of a given type.
This XML file doesn't contain any presentation information, which is contained in the stylesheet. Separating the document's content and the document's styling information allows displaying the same document on different media like screen, paper, cell phone , and it also enables users to view the document according to their preferences and abilities, just by modifying the style sheet.
Here are two templates from the stylesheet used to format the XML file. By separating the presentation style of documents from the content of documents, CSS2 simplifies Web authoring and site maintenance.
XSL, on the other hand, is able to tranform documents. This way, the two languages complement each other and can be used together. Both languages can be used to style XML documents. CSS and XSL will use the same underlying formatting model and designers will therefore have access to the same formatting features in both languages.
Aimed mainly at complex documentation projects, XSL also has many uses in automatic generation of tables of contents, indexes, reports, and other more complex publishing tasks. Examples on using XSL can be found throughout this manual. What is the syntax to compare not an element but the value of the element?
So far, the documentation I have read tests for tags but not values within the tags. Here is a portion of my XSL document:. I want to construct an IF statement that will display the information of employees with salaries greater than in red. How do I insert the value of sal in the IF statement? However the child attributes are not being returned when we use syntax of type:.
The answer is whitespace. Since your djia. However, a bug in XDK for Java currently prevents this from working correctly. One workaround is to use:. Here is the first attempt I wrote, which works:. I'd like to make one rule which matches all of these and does the correct transformation.
Here is one attempt:. You will need:. What do I need to do? They are just literal characters angle brackets, names, and quotes that look like elements and attributes, but are not in the infoset tree as separate nodes. The best you can do is:. As far as XSLT processing goes, an XPath expression is a black box that yields a value—a node-set, number, string, boolean, or result tree fragment. However, as noted in the previous chapter, all XPath expressions are evaluated in a context.
The current node and current node list supply an important part of that context, as shown in the following table. The current node and current node list remain the same throughout the content of a given template rule—with one important exception. XSLT's other mechanism for iterating over a list of nodes, the xsl:for-each instruction, also changes the current node and current node list.
Like xsl:apply-templates , xsl:for-each iterates over a given node-set in document order by default. But rather than dispatching the behavior for each node to a template rule, it instantiates the content of the xsl:for-each element itself—the same content for every node in the list.
For example, the following template rule includes several relative XPath expressions. The context node for each expression depends on what the current node is in XSLT processing:. The number , item , and total expressions are evaluated with an order element as the context node. However, the expression name is evaluated with an item element as the context node.
That's because the current node, and thus the XPath context node, changes as processing enters the xsl:for-each instruction and changes back after it completes. Thus, the document that this template rule is designed to process probably has a structure like this:. Inside a predicate, the context node changes for each evaluation of the predicate expression. XSLT provides a function specifically for the purpose of accessing the current node from inside a predicate expression.
Whitespace stripping is also an optional process that can be applied to the source tree before XSLT processing begins. By default, unlike the stylesheet tree, all whitespace is preserved in the source tree.
XSLT processing is primarily concerned with constructing a result tree. Serialization involves converting that result tree to an actual XML stream or file. The xsl:output element is a top-level element that lets you give hints to the XSLT processor about how you want your result tree to be serialized.
Technically, the XSLT processor is not required to heed the hints you give it or even to serialize the result tree at all , but if it does heed your hints, it must follow the rules for interpreting the xsl:output element. The xsl:value-of and xsl:text instructions have an optional attribute named disable-output-escaping , whose value must be yes or no. The default value is no. When the value is yes , the XSLT processor disables the normal escaping of markup characters in the value of the text node when it serializes the result.
For example, consider this instruction:. You should rarely, if ever, use the disable-output-escaping attribute. Quoting the XSLT recommendation itself:. Since disabling output escaping may not work with all XSLT processors and can result in XML that is not well-formed, it should be used only when there is no alternative. The following table shows a list of general programming use cases and the corresponding XSLT elements that you should refer to in that chapter.
If you don't already know what you're looking for, this table can serve as a map. XSLT is simpler than you think! Example 1: A template rule. To continue reading, buy the whole book at oreilly.
Contact: evan lenzconsulting. Name test for a particular name, or processing-instruction Literal. Any other location path pattern.
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