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Detecting attempts to find these weaknesses is a critical protection mechanism.

These definitions are used within this document: Ensure that data is not only validated, but business rule correct.

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.

For this to work, you'll configure a list of rules (called service.

Behind the scenes, a constraint is simply a PHP object that makes an assertive statement.

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In Symfony, constraints are similar: they are assertions that a condition is true.PHP 5 allows you to validate files against DTDs, XML Schema, and Relax NG schema.The DOM extension supports all three types, while Simple XML provides only an XML Schema validator.You can validate a DOM object only against the DTD defined at the top of the XML document.To ensure that the application is robust against all forms of input data, whether obtained from the user, infrastructure, external entities or database systems. This weakness leads to almost all of the major vulnerabilities in applications, such as Interpreter Injection, locale/Unicode attacks, file system attacks and buffer overflows.

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