Many methods for XML processing have been proposed in the last few years. One popular approach is to process XML documents by using existing programming languages. Another popular approach is to create a new programming language specialized to the domain of XML processing. We propose a new approach of constructing XML processors: embedding XML processing language on Lisp. Owing to this approach, we may seamlessly invoke the functions of XML-specific language from Lisp. The other novel features of our approach are shuffle expression pattern matching and dynamic validation of XML documents. A shuffle expression is an extension of a regular expression; it supports shuffle (interleave) operator that is useful, for example, to represent unordered records such as bibliography data. Dynamic validation makes it possible to validate XML documents with respect to the schema or patterns at run time.