Some items do not belong to a classification

This item http://www.ims/concepts/ateco2007/Ateco2007/812201 does not seem to be related to a classification with the skos:inScheme predicate.

That's why correspondence details cannot be loaded for http://stamina-project.org/codes/nacer2-ateco2007/correspondence (http://localhost:8080/correspondence/nacer2-ateco2007) : the source and target classifications are retrieved via the sourceConcept and targetConcept from an association, and the association refers to this item without inScheme relation (see

Classification-Explorer/src/js/sparql/queries.js

Lines 210 to 241 in 4954cf8

	//HACK For now, the database provides information about the classifications
	//being compared, but no information about which classification acts as the
	//source, and which acts as the target. This information is retrieved by valuing
	//one assocaition
	// const correspondenceDetails = correspondence => `
	// PREFIX skos:<http://www.w3.org/2004/02/skos/core#>
	// PREFIX xkos:<http://rdf-vocabulary.ddialliance.org/xkos#>
	// SELECT ?classification ?code ?label {
	// <${correspondence}> xkos:compares ?classification .
	// ?classification skos:prefLabel ?label ;
	// skos:notation ?code
	// }
	// `
	const correspondenceDetails = correspondence => `
	PREFIX skos:<http://www.w3.org/2004/02/skos/core#>
	PREFIX xkos:<http://rdf-vocabulary.ddialliance.org/xkos#>
	SELECT
	?source ?sourceCode ?sourceLabel
	?target ?targetCode ?targetLabel {
	<${correspondence}> xkos:madeOf ?association .
	?association xkos:sourceConcept ?sourceItem ;
	xkos:targetConcept ?targetItem .
	?sourceItem skos:inScheme ?source .
	?targetItem skos:inScheme ?target .
	?source skos:prefLabel ?sourceLabel ;
	skos:notation ?sourceCode .
	?target skos:prefLabel ?targetLabel ;
	skos:notation ?targetCode .
	}
	LIMIT 1
	`

)