XLIFF 2.1 csprd01: Enforcing <target> existence based on segment state

Hello,

file

<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns:mda="urn:oasis:names:tc:xliff:metadata:2.0"
    xmlns="urn:oasis:names:tc:xliff:document:2.0" srcLang="en-US" trgLang="fr-FR" version="2.0">
    <file id="1">
        <group id="content">
            <unit id="1">
                <segment state="final">
                    <source>1</source>
                </segment>
            </unit>
        </group>
    </file>
</xliff>

is reported as valid with state="final", while the <target> is not present.

Could you please consider enforcing existence of <target> (even if it's empty) for segment states different from default?

If you decide to do so, could you please update processing requirements in http://docs.oasis-open.org/xliff/xliff-core/v2.1/csprd01/xliff-core-v2.1-csprd01.html#contentmodification accordingly, and reference them (at least) in http://docs.oasis-open.org/xliff/xliff-core/v2.1/csprd01/xliff-core-v2.1-csprd01.html#state and http://docs.oasis-open.org/xliff/xliff-core/v2.1/csprd01/xliff-core-v2.1-csprd01.html#target

Thanks,
Jan