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We can see clearly that there is a catalogue containing CDs, each of which contains some tracks (music aficionados will notice that I have cut down the track listings for space! You can also see that XML can be less efficient than some other file formats.Yet, in many cases, the loss in efficiency that results from the increased size can be made up by the speed of processing a well-defined XML file, as parsers (programs that read XML) can predict the structure.We therefore define attributes of the element in the form attribute="value".

Designed as a stricter and simpler document format than SGML, XML is now used everywhere to produce cross-platform interoperable file formats. A proper understanding will allow you to use it effectively in your projects.

The "area code" for XML namespaces is a URI, which is associated with a prefix for the namespace.

We define a namespace using an xmlns declaration, followed by the prefix, which is equal to a URI that uniquely identifies the namespace: Parsers can now recognise both meanings of "film type" and handle them accordingly.

This describes what is meant by "interoperable file format" — once you produce an XML file, it is open to everyone.

An input, and all the information required to understand the structure of your data, is included in the file. Here’s a text file and an XML file that both store the same information: Notice how the subject of our data is defined in the XML file.

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