<?xml version="1.0" encoding="UTF-8"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0"
         datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

    <start>
        <ref name="command-output" />
    </start>

    <define name="command-output">
        <element name="command">
            <attribute name="code"> <data type="integer" /> </attribute>
            <optional>
                <element name="output">
                    <attribute name="source"><value>stdout</value></attribute>
                    <text />
                </element>
            </optional>
            <optional>
                <element name="output">
                    <attribute name="source"><value>stderr</value></attribute>
                    <text />
                </element>
            </optional>
        </element>
    </define>
</grammar>