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The W3C XML specification states that a program should not continue to process an XML document if it finds a validation error. The reason is that XML software should be easy to write and all XML documents should be compatible. With HTML, for example, it is possible to create documents with lots of errors (for instance, when you forget an end tag). One of the main reasons that various HTML browsers have performance and compatibility problems is that they have different methods of figuring out how to render a document when an HTML error is encountered. Using XML helps to eliminate such problems.

Even when creating XML documents, errors are easily introduced. When working with large projects or a large number of files, the probability that errors will occur is even greater. Preventing and solving errors in your projects can be time consuming and frustrating. Fortunately, Oxygen XML Author provides validation functions that allow you to easily identify errors and their location.