XML Schema

Name

xs:length — Facet to define the length of a value.

Synopsis

<xs:length
           fixed          = xs:boolean : “false”
           id             = xs:ID
           value          = xs:nonNegativeInteger
           {any attributes with non-schema namespace}
           >
           Content: (xs:annotation?)
</xs:length>

May be included in: xs:restriction (simple type), xs:restriction (simple content)

May be used as facet for: xs:anyURI, xs:base64Binary, xs:ENTITIES, xs:ENTITY, xs:hexBinary, xs:ID, xs:IDREF, xs:IDREFS, xs:language, xs:Name, xs:NCName, xs:NMTOKEN, xs:NMTOKENS, xs:normalizedString, xs:NOTATION, xs:QName, xs:string, xs:token

Description

xs:length is a facet that allows the definition of the length expressed in a unit that depends on the datatype. For most of the datatypes, the unit is the character as defined in the XML 1.0 Recommendation (i.e., Unicode characters defined by ISO/IEC 10646 that may be represented on more than 8 bits). The exceptions are the binary datatypes (xs:hexBinary and xs:base64Binary), for which lengths are expressed in number of bytes (8 bits) of binary data, and all the list datatypes, for which lengths are expressed in number of list items.

xs:length constrains the value space. In practice, this means that it is checked after whitespace replacement and collapsing, as defined by the xs:whiteSpace facet.

Restrictions

This is a logical length that has often no direct relation to the size of storage needed for the value.

The value of this facet cannot be modified during further restrictions, and the value of the fixed attribute is meaningless ...