Schema Central > XML Schema 1.1 > xsd:ID

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xsd:ID

The type xsd:ID is used for an attribute that uniquely identifies an element in an XML document. An xsd:ID value must be an NCName. This means that it must start with a letter or underscore, and can only contain letters, digits, underscores, hyphens, and periods.

xsd:ID carries several additional constraints:

Their values must be unique within an XML instance, regardless of the attribute's name or its element name.
A complex type cannot include more than one attribute of type xsd:ID, or any type derived from xsd:ID.
xsd:ID attributes cannot have default or fixed values specified.

Simple Type Information

Namespace: http://www.w3.org/2001/XMLSchema

Schema Document: builtintypes.xsd

Content

Based on xsd:NCName
Pattern: [\i-[:]][\c-[:]]* (Defined in type xsd:NCName)
White Space: collapse (Defined in type xsd:token)

Type Inheritance Chain

xsd:anyType
- xsd:anySimpleType
  - xsd:anyAtomicType
    - xsd:string
      - xsd:normalizedString
        xsd:token
        xsd:Name
        xsd:NCName
        xsd:ID

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