A system and method for expressing XML schema validation using Java in a declarative manner is disclosed. In one embodiment of the present invention a method for processing information comprises defining a schema validation using metadata stored in a database and building a memory model using the metadata. Input data for validation is received in a validation engine, which validates the input data by executing a Java program in the validation engine using the input data and the metadata. An output is generated from the validation engine that identifies the input data as being validated or not validated.