Abstract
This chapter describes W3C XML schema data facets that can be applied to a data type. Data architects quickly recognize that facets provide extended data type support. Commonly applied facets include length, value limits, decimal digits, enumeration, patterns, and white space. The most familiar facets are those that support lengths and fractional decimal digits. W3C XML Schemas provide extensive support for facets. Depending upon the data type to which they are applied and the context in which they are used, facets can also be combined. The responsibility for data types and their constraining facets should be fundamental to the role of the data architect. The data architect is also responsible for defining data elements, assembling them into groups, and specifying relationships among groups.
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