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XML schema Element
 Complete XML Schema Reference
Definition and Usage
The schema element defines the root element of a schema.
Element Information
Syntax
<schema
id=ID
attributeFormDefault=qualified|unqualified
elementFormDefault=qualified|unqualified
blockDefault=(#all|list of (extension|restriction|substitution))
finalDefault=(#all|list of (extension|restriction|list|union))
targetNamespace=anyURI
version=token
xmlns=anyURI
any attributes
>
((include|import|redefine|annotation)*,(((simpleType|complexType|
group|attributeGroup)|element|attribute|notation),annotation*)*)
</schema>
|
| Attribute |
Description |
| id |
Optional. Specifies a unique ID for the element |
| attributeFormDefault |
Optional. The form for attributes declared in the target namespace of this
schema. The value must be "qualified" or "unqualified". Default is
"unqualified". "unqualified" indicates that attributes from the target namespace
are not required to be qualified with the namespace prefix. "qualified"
indicates that attributes from the target namespace must be qualified with the
namespace prefix |
| elementFormDefault |
Optional. The form for elements declared in the target namespace of this schema.
The value must be "qualified" or "unqualified". Default is "unqualified".
"unqualified" indicates that elements from the target namespace are not required
to be qualified with the namespace prefix. "qualified" indicates that elements
from the target namespace must be qualified with the namespace prefix |
| blockDefault |
Optional. Specifies the default value of the block attribute on element and
complexType elements in the target namespace. The block attribute prevents a
complex type (or element) that has a specified type of derivation from being
used in place of this complex type. This value can contain #all or a list that
is a subset of extension, restriction, or substitution:
- extension - prevents complex types derived by extension
- restriction - prevents complex types derived by restriction
- substitution - prevents substitution of elements
- #all - prevents all derived complex types
|
| finalDefault |
Optional. Specifies the default value of the final attribute on element,
simpleType, and complexType elements in the target namespace. The final
attribute prevents a specified type of derivation of an element, simpleType, or
complexType element. For element and complexType elements, this value can
contain #all or a list that is a subset of extension or restriction. For
simpleType elements, this value can additionally contain list and union:
- extension - prevents derivation by extension
- restriction - prevents derivation by restriction
- list - prevents derivation by list
- union - prevents derivation by union
- #all - prevents all derivation
|
| targetNamespace |
Optional. A URI reference of the namespace of this schema |
| version |
Optional. Specifies the version of the schema |
| xmlns |
A URI reference that specifies one or more namespaces for use in this schema. If
no prefix is assigned, the schema components of the namespace can be used with
unqualified references |
| any attributes |
Optional. Specifies any other attributes with non-schema
namespace |
Example 1
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="values" type="xs:string">
</xs:schema>
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Example 2
In this example, the schema components (element name, type) in the
http://www.w3.org/2001/XMLSchema namespace are unqualified and those for
http://www.w3schools.com/w3schoolsschema (mystring) are qualified with the wsc
prefix:
<?xml version="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:wsc="http://www.w3schools.com/w3shoolsschema">
<element name="fname" type="wsc:mystring"/>
</schema>
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Complete XML Schema Reference
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