XML schema validation using parsing expression grammars

Schema validation is an integral part of reliable information exchange on the Web. However, implementing an efficient schema validation tool is not easy. We highlight the use of parsing expression grammars (PEGs), a recognition-based foundation for describing syntax, and apply it to the XML/DTD validation. This paper shows that structural schema constraints in document type definitions (DTDs) can be validated by the converted PEGs with the linear time and constant space consumption. We study the performance of several existing PEG-based tools, and then confirm that the converted PEGs achieve a practical and even competitive level of performance under existing standard XML/DTD validators.