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XML Schema (XSD)

<xs:import>

Makes schema components from a different target namespace available to the importing schema.

import crosses a namespace boundary. namespace identifies the component namespace; schemaLocation is only a retrieval hint.

Imports belong near the start of xs:schema. A processor may resolve the namespace through a catalog instead of the supplied location.

Format
XML Schema (XSD)
Namespace
XML Schema Definition (XSD)
Parent
<xs:schema>
How many
Any number before schema component declarations.

What it contains

Nothing — this element holds a value rather than other elements. Its content is text, and the constraints below are what that text has to be.

Attributes

  • namespaceoptionalThe target namespace of the components to import.
  • schemaLocationoptionalA location hint that a resolver may replace or ignore.

Cardinality and constraints

Any number before schema component declarations.

  • Used for a different target namespace.
  • schemaLocation is a hint and may be resolved externally.

What our validator does

The XML validator checks well-formedness and selected SOAP or XML Schema vocabulary rules. It reports this content-model defect with a concrete repair while staying silent on rules it cannot establish from one document.

Broken and fixed

Both documents below are well-formed XML — that is the point of this corpus — and both are run through the validator on every test run. The verdicts here are what it returned, not what we expect it to.

broken
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:example:catalog">
  <xs:complexType name="Product"><xs:attribute name="active" type="xs:boolean" maxOccurs="2"/></xs:complexType>
</xs:schema>
xs:attribute cannot use minOccurs or maxOccurs; attributes use the use attribute instead.
fixed
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="urn:example:catalog" targetNamespace="urn:example:catalog" elementFormDefault="qualified">
  <xs:simpleType name="Sku"><xs:restriction base="xs:string"><xs:minLength value="1"/></xs:restriction></xs:simpleType>
  <xs:complexType name="Product"><xs:sequence><xs:element name="sku" type="tns:Sku"/></xs:sequence><xs:attribute name="active" type="xs:boolean"/></xs:complexType>
  <xs:element name="product" type="tns:Product"/>
</xs:schema>
No errors. Warnings may remain — a conforming feed can still be missing a self link — but nothing here is wrong.

Where it reaches

Related elements

All 49 elements

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