Simple Type Definitions : Simple Type « XML Schema « XML Tutorial

<simpleType final="#all | (list | union | restriction)"
      {any attributes with non-schema namespace}
  Content: (annotation?, (restriction | list | union))

3.53.Simple Type
3.53.1.Declaring an Element with a Simple Type
3.53.2.Simple Type Definitions
3.53.3.XML Schemas provide a number of built-in simple types.
3.53.4.User-Defined Data types
3.53.5.The simple type may be defined globally, as a child of an attribute declaration, or within an element content model
3.53.6.A ISO date without a time zone
3.53.7.An anonymous simple string datatype for which any one of three literal string patterns (Small, Medium, or Large) are acceptable