The parser can be used to validate a document. This means +that all the constraints that must hold for a valid document are actually +checked. Validation is the default mode of PXP, i.e. every document is +validated while it is being parsed.
In the examples directory of the distribution you find the +pxpvalidate application. It is invoked in the following way: + +
pxpvalidate [ -wf ] file...+ +The files mentioned on the command line are validated, and every warning and +every error messages are printed to stderr.
The -wf switch modifies the behaviour such that a well-formedness parser is +simulated. In this mode, the ELEMENT, ATTLIST, and NOTATION declarations of the +DTD are ignored, and only the ENTITY declarations will take effect. This mode +is intended for documents lacking a DTD. Please note that the parser still +scans the DTD fully and will report all errors in the DTD; such checks are not +required by a well-formedness parser.
The pxpvalidate application is the simplest sensible program +using PXP, you may consider it as "hello world" program.