Features

xml-psychiatrist has a number of interesting features:

• Basic structural validation

• Regular expressions for matching things

• Type checking using the Common Lisp type system

• Namespace support (still relatively experimental, since I have never found much use for XML namespaces and therefore have never used them much).

• The full power of Common Lisp. You can define your own functions for validating data (see 3), or you can even extend the framework itself (see 4).