OGC Records update does not support XML payloads

[nicokant]

I'm using pycsw-3.0.0-beta2 with transactions enabled.

As documented it's possible to insert new items using POST and different content-types (xml, geojson), but it's not possible to update a single entry sending a new xml with the method PUT.

httpx.request(
            method="put",
            url="http://localhost:5000/collections/metadata:main/items/test_item",
            content="<?xml version="1.0" ?>\n<gmd:MD_Metadata xmlns:gco="http://www.isotc211.org/2005/ .....",
            headers={"Content-Type": "application/xml"},
        )

returns status 400

{"code": "InvalidParameterValue", "description": "No data found"}