Xmlvalidatingreader example c net dating at college
While an XML file might conform to the XML specification, it might not be a valid form of a particular dialect.
An XML schema lets you verify that certain elements are present, while making sure that the values presented are of the correct type.
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.
But XML crucially differs from plain text in that it allows you to structure your data in a standard manner.
This is important — it means that other systems can interpret your XML, which is not as easily achievable in plain text.
The way we'd interpret the plain text file would be dependent on how we designed our own format.
No information exists to tell others what the actual data means, its order, or how to parse (read) it in other projects.
But, as the consumers of these files, how can we differentiate between them? An XML namespace allows us to qualify an element in the same way as telephone area codes qualify phone numbers.For example, XML 1.0 requires that all XML files consist of one root element; that is, a single element contains all other elements.In our music library example above, catalog is our root element, as it contains all our other elements.There might be thousands of telephone numbers of 545-321.When we add an area code and, perhaps, an international code, we make the number unique: 44 020 545-321.