UCIS 1.0 XML interchange format as pyucis writes it - e.g. for PyVSC or a converted Verilator coverage file -: pyucis' 'XmlWriter' (checked: pyucis 0.2.0, commit 11c39fd0). The elements are in no namespace; the root binds the prefix 'ucis' to the XML Schema instance namespace, but uses it for no element. A coverpoint bin and a cross bin state a 'name' and a 'key'; a coverpoint bin's 'type' is 'bins', 'default', 'ignore' or 'illegal'; a covergroup instance may have no coverpoint - as pyucis' own schema 'ucis.xsd' has them. Otherwise it is the schema of the UCIS 1.0 standard (section 9.14), see 'UCIS-1.0.xsd': the same complex types, elements, attributes, their order, occurrences, types and defaults.