import in XSD and its implementation - xsd

Question

I have 2 separate XSDs with some common attributes. I want to create another XSD and put all my common attributes in the separate XSD and import them in the 2 XSDs i have already rather than repeating them or duplicating them in both the XSDs.
Is there any reference for such implementation?

Answer 1

We do it like this:
Shared "library" xsd:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="http://www.common.namespace/" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.common.namespace/">
<xs:attribute name="ACommonAttribute" type="xs:float" default="1.7"/>
</xs:schema>
Left xsd with same target namespace:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="http://www.common.namespace/" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.common.namespace/">
<xs:include schemaLocation="Common.xsd"/>
<xs:element name="MyLeftElement">
<xs:annotation>
<xs:documentation>Comment describing your root element</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:attribute ref="ACommonAttribute"/>
</xs:complexType>
</xs:element>
</xs:schema>
Right xsd with different target namespace (needs an Import instead if an Include statement)
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="http://another.namespace/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:libs="http://www.common.namespace/" targetNamespace="http://another.namespace/">
<xs:import namespace="http://www.common.namespace/" schemaLocation="Common.xsd"/>
<xs:complexType name="RightComplexType">
<xs:sequence>
<xs:element name="Bit">
<xs:complexType>
<xs:attribute ref="libs:ACommonAttribute"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:schema>