base-schema.xsd

<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="urn:switchyard-config:switchyard:1.0"
        xmlns:swyd="urn:switchyard-config:switchyard:1.0"
        xmlns:sca="http://docs.oasis-open.org/ns/opencsa/sca/200912"
        elementFormDefault="qualified">

    <import namespace="http://docs.oasis-open.org/ns/opencsa/sca/200912"
            schemaLocation="sca-1.1-cd06.xsd"/>

    <element name="switchyard" type="swyd:SwitchYardType"/>
    <complexType name="SwitchYardType">
        <sequence>
            <element ref="sca:composite" minOccurs="0" maxOccurs="1"/>
            <element ref="swyd:transforms" minOccurs="0" maxOccurs="1"/>
        </sequence>
        <attribute name="name" type="string" use="optional"/>
        <attribute name="targetNamespace" type="string" use="optional"/>
    </complexType>

    <element name="transforms" type="swyd:TransformsType"/>
    <complexType name="TransformsType">
        <sequence>
            <element ref="swyd:transform" minOccurs="0" maxOccurs="unbounded"/>
        </sequence>
    </complexType>

    <element name="transform" type="swyd:TransformType" abstract="true"/>
    <complexType name="TransformType" abstract="true">
        <attribute name="from" type="string" use="required"/>
        <attribute name="to" type="string" use="required"/>
    </complexType>

</schema>

sample.xml

<switchyard xmlns="urn:switchyard-config:switchyard:1.0">
    <transforms xmlns:trans="urn:switchyard-config:transform:1.0">
        <trans:transform.java from="msgA" to="msgB" class="org.examples.transform.AtoBTransform"/>
        <trans:transform.smooks from="msgC" to="msgD" config="" />
    </transforms>
</switchyard>

trasnform-schema.xsd

<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="urn:switchyard-config:transform:1.0"
        xmlns:swyd="urn:switchyard-config:switchyard:1.0"
        xmlns:trfm="urn:switchyard-config:transform:1.0"
        elementFormDefault="qualified">

    <import namespace="urn:switchyard-config:switchyard:1.0"
            schemaLocation="file:///whatever"/>

    <element name="transform.java" type="trfm:JavaTransformType" substitutionGroup="swyd:transform"/>
    <complexType name="JavaTransformType">
        <annotation>
            <documentation xml:lang="en">
                Generic/Custom Java Transformer Configuration.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="swyd:TransformType">
                <attribute name="class" type="string" use="required">
                    <annotation>
                        <documentation xml:lang="en">
                            The name of the Java Transformer implementation class.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>

    <element name="transform.smooks" type="trfm:SmooksTransformType" substitutionGroup="swyd:transform"/>
    <complexType name="SmooksTransformType">
        <annotation>
            <documentation xml:lang="en">
                Smooks Transformer Configuration.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="swyd:TransformType">
                <attribute name="config" type="string" use="required">
                    <annotation>
                        <documentation xml:lang="en">
                            Smooks Configuration file path.
                        </documentation>
                    </annotation>
                </attribute>
                <attribute name="reportPath" type="string" use="optional">
                    <annotation>
                        <documentation xml:lang="en">
                            Smooks Execution Report filesystem path.
                            <p/>
                            An Execution Report is a HTML file showing how all the input message
                            fragments were processed by Smooks, including the contents of the Smooks
                            ExecutionContext at each stage in the processing.
                            <p/>
                            Use for debug purposes only.  Adds significant processing overhead.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>

</schema>