Like the other books in the series, this guide features comprehensive appendices listing all the datatypes and data facets, code indexes, and other time-saving features. About the Author R. Permissions Request permission to reuse content from this site. Table of contents Reviews Notes Dedication R.
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Remember, you can use variable references in expressions but not patterns. String types are useful if you are interested only in the text of nodes, rather than in the whole node-set. String types use XPath functions, most notably, string. This is just a simple example:.
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It is also possible to declare a variable that has a number value. You do this by using the XPath function number. The Boolean type has only two possible values, true or false. As an example, we are going to use a Boolean variable to test to see if a parameter has been passed into the stylesheet. We start with an empty-string declaration for the parameter isOk.
In the test attribute of when , the boolean function tests the value of isOk. If the value is an empty string, as we defined by default, boolean evaluates to false , and the template is not instantiated. If it does have a value, and it can be any value at all, boolean evaluates to true. The final datatype is the result tree fragment.
Essentially it is a chunk of text a string that can contain markup. Let's look at an example before we dive into the details:. Notice we didn't use the select attribute to define the variable. We aren't selecting a node and getting its value, rather we are creating arbitrary text. Instead, we declared it as the content of the element.
The text in between the opening and closing variable tags is the actual fragment of the result tree. In general, if you use the select attribute as we did earlier, and don't specify content when declaring variables, the elements are empty elements.
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If you don't use select and you do specify content, the content is a result tree. The way you retrieve the content from the variable and get it into the result tree is by using the copy-of element. Let's see how we would do this:. The result tree would now contain two elements: The modules include facilities to handle dates and times, math, and strings.
In previous chapters, we have imported and used multiple XML and schema documents.
It is also possible to use multiple stylesheets using the import and include elements, which should be familiar. Including an external stylesheet is very similar to what we have done in earlier chapters with schemas. The include element only has one attribute, which is href. It is required and always contains a URI Uniform Resource Identifier reference to the location of the file, which can be local in the same local directory or remote. You can include as many stylesheets as you need, as long as they are at the top level.
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All the items just become part of the stylesheet tree itself, and the processor treats them all the same. Here are declarations for including a local and remote stylesheet:. Since include returns all the elements in the included stylesheet, you need to make sure that the stylesheet you are including does not include your own stylesheet. When including multiple files, you need to make sure that you are not including another stylesheet multiple times.
This could cause template rule duplication and errors. These are some confusing rules, but they are easy to avoid if you carefully examine the stylesheets before they are included.