The importance of XML (eXtensible Markup Language) can't be understated; their usefulness may range from data sharing to data transport in software systems. Schema languages describe the structure of an XML document and the common schemas languages are Document Definition Type (DTD), W3C XML Schema and RelaxNG. Applications depend heavily on XML documents to be free of error and this makes it imperative to determine the quality of such schema document. Schema metrics is used to achieve this, and several of them have been proposed in recent years. In this paper we present the existing schema metrics and to make comparative studies on all schema metrics, figuring out the features, advantages and limitations of each metrics.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 email@example.com
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 firstname.lastname@example.org