XML Schema Element

Definition and Usage

The schema element defines the root element of a schema.

Element Information

Parent elements: NONE

Syntax

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>

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 https://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="https://www.w3schools.com/w3shoolsschema">

<element name="fname" type="wsc:mystring"/>

</schema>

❮ Complete XML Schema Reference