ApigeeSamples

<AssignMessage name="create1">
<AssignTo type="[request]/response" createNew="[true]/false">sc.request</AssignTo>
<IgnoreUnresolvedVariables>true/[false]</IgnoreUnresolvedVariables>

// allow any order
<Copy source="request"> // if no children do copy all
    <Headers>
        <Header name="h1"/>
        <Header name="h2"/>
    </Headers>