Capture One creates an xmp sidecare file like this:
"<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.5.0">
<rdf:RDF xmlns:rdf="
http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:xmp="
http://ns.adobe.com/xap/1.0/"
xmlns:dc="
http://purl.org/dc/elements/1.1/"
xmlns:photoshop="
http://ns.adobe.com/photoshop/1.0/">
<xmp:Rating>0</xmp:Rating>
<xmp:Label>Pink</xmp:Label>
<dc:rights>
<rdf:Alt>
<rdf:li xml:lang="x-default">Copyright 2016 Thomas Reynolds - all rights reserved.</rdf:li>
</rdf:Alt>
</dc:rights>
<dc:creator>
<rdf:Seq>
<rdf:li>Thomas Reynolds</rdf:li>
</rdf:Seq>
</dc:creator>
<photoshop:Urgency>4</photoshop:Urgency>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
"
Workflow starts with raw file organizing and editing. PM will not read this Pink label info in which is created by Capture One in the form of xmp side car. It is ignored. If I do a sync update in PM, it creates a new xmp and erases xmp label info. I could use Urgency code sync PM label option, however, Capture One label colors are not properly aligned with Urgency code numbers. I could customize order of colors on PM side to match Urgency codes but it just seems silly. Why can't xmp color label be the universal standard that everything syncs to and not even talk about urgency codes ? I am sure the answer has to do something with IPTC legacy or something like that.