id A unique ID for the element. A unique ID for the element. version Version of the schema. Version of the schema. targetNamespace URI reference of the namespace of this schema. URI reference of the namespace of this schema. xmlns URI reference for one or more namespaces for use in this schema. If no prefix is used, then components of that namespace may be used unqualified. URI reference for one or more namespaces for use in this schema. If no prefix is used, then components of that namespace may be used unqualified. attributeFormDefault qualified unqualified Default form for all attributes within this schema. Default form for all attributes within this schema. elementFormDefault qualified unqualified Default form for all elements within this schema. Default form for all elements within this schema. blockDefault finalDefault