package (available at provides a way to validate XML files against a Document Type Definition (DTD).
However, because it uses SAX, it is not easy to combine DTD validation with DOM.
All sections should be reviewed The most common web application security weakness is the failure to properly validate input from the client or environment.
Data from the client should never be trusted for the client has every possibility to tamper with the data.
More information on XML can be found in our XML Tutorial. Expat is an event-based parser, it views an XML document as a series of events.
When an event occurs, it calls a specified function to handle it.
Given a value, a constraint will tell you if that value adheres to the rules of the constraint.
The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.
The DOM extension supports all three types, while Simple XML provides only an XML Schema validator.For example, interest rates fall within permitted boundaries.A php tool to lint and validate xml files from the commandline.Validating any file using DOM is a similar process, regardless of the underlying schema format.
To validate, call a validation method on a DOM object.So far, this is just an ordinary class that serves some purpose inside your application.