XML Tutorials - MarkupTutorials.com
Although it isn't all that common, sometimes you need to embed application-specific instructions into your information, to affect how it will be processed. XML provides a mechanism to allow this, called processing instructions or, more commonly, PIs.
January 20,
2006
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Now we have an easy and platform-independent method of describing XML data, validating its type as we wish and modifying and reading it programmatically. So we basically have a transportable miniature database. No surprise then that when you start to work with it, you'll feel the need for a query mechanism. Using the DOM, you can get to each and every node in your document, but it can get tiresome, maneuvering through the hierarchies of children to find that single node you are interested in.
January 20,
2006
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When we want to exchange information with other applications, it would be nice if everyone would use the same document types (that is use the same validation rules). However, it is inevitable that, for comparable types of data, several document types will emerge. Some repositories will emerge, where schemas and DTDs can be stored and shared. Often these are industry-wide initiatives. However, several schemas for the same data will exist.
January 20,
2006
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First of all a warning: be careful - the eval and script elements are not specified in the XSLT recommendation. They are Microsoft extensions, available only in their MSXML implementation. So, if you want to be able to switch XSLT implementations later on, do not use these features.
January 20,
2006
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Once you have read this section, you will have found out that its title is a bit deceptive. You, as a programmer, have certain expectations about a new programming language when you start learning it. One of them is that you expect it to be possible to store values in variables, change them and retrieve them later. Although XSLT has an element called variable, you actually cannot do much with it. This may sound unbelievable, but it is a result of the way XSLT works that you cannot have variables. This is a thing that beginning XSLT programmers have many difficulties grasping.
January 20,
2006
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XSLT processor vendors are free to add their own private extensions to the language. The XSLT specification even specifies how they should indicate if an extension element or extension function is supported by their implementation.
January 20,
2006
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With XML only consisting of data content, there is a clear need for ways to display this content. This is commonly referred to as 'styling the content'. At the time of writing, there are two W3C standard stylesheet languages: CSS (Cascading Stylesheets) and XSLT. Both can be used to assign certain looks to specific element types in an XML document.
January 20,
2006
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This section describes empty elements and XML declaration in XML.
January 20,
2006
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Comments provide a way to insert into an XML document text that isn't really part of the document, but rather is intended for people who are reading the XML source itself.
January 20,
2006
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In addition to tags and elements, XML documents can also include attributes.
January 20,
2006
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