How to use the SPARQL CONSTRUCT in the new MeSH endpoint? - sparql

Question

I'm trying to use the construct CONSTRUCT in the SPARQL MeSH endpoint but this one always return an empty query.
In particular i'm finding the alias of some medical names.
Basically the SELECT query that works is:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX meshv: <http://id.nlm.nih.gov/mesh/vocab#>
PREFIX mesh: <http://id.nlm.nih.gov/mesh/>
PREFIX mesh2015: <http://id.nlm.nih.gov/mesh/2015/>
SELECT ?d ?dName ?c ?cName
FROM <http://id.nlm.nih.gov/mesh>
WHERE {
?d a meshv:Descriptor .
?d meshv:concept ?c .
?d rdfs:label ?dName .
?c rdfs:label ?cName
FILTER(REGEX(?dName,'infection','i') || REGEX(?cName,'infection','i'))
}
ORDER BY ?d
and i'm finding something as the following:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX meshv: <http://id.nlm.nih.gov/mesh/vocab#>
PREFIX mesh: <http://id.nlm.nih.gov/mesh/>
PREFIX mesh2015: <http://id.nlm.nih.gov/mesh/2015/>
CONSTRUCT{
?dName a (subject)
is alias of (predicate)
?cName (object)
}
WHERE {
?d a meshv:Descriptor .
?d meshv:concept ?c .
?d rdfs:label ?dName .
?c rdfs:label ?cName
FILTER(REGEX(?dName,'infection','i') || REGEX(?cName,'infection','i'))
}
Reference documents
informs that CONSTRUCT is supported and you can try to query here, the SPARQL endpoint should be here.
Thank you for your help.