id Layer

The <id> layer represents numeric message ID. The frame definition must NOT contain more than one <id> layer.

<?xml version="1.0" encoding="UTF-8"?>
<schema ...>
    <frame name="ProtocolFrame">
        <id name="Id">
            <int name="IdField" type="uint8" />  
        </id>
        <payload name="Data" />
    </frame>
</schema>

The <id> layer doesn't have any extra properties in addition to common ones.