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Here is my naive query for bridges:

SELECT ?item WHERE {
    ?item wdt:P31 wd:Q12280.  # Item's type is: bridge
}

Problem: It only returns a small fraction of all bridges, because railway bridges (and all other subclasses of "bridge") are not counted.

How to retrieve all items, including sub-classes/sub-sub-classes/etc?
It MUST be with SPARQL.

Here is my naive query for bridges:

SELECT ?item WHERE {
    ?item wdt:P31 wd:Q12280.  # Item's type is: bridge
}

Problem: It only returns a small fraction of all bridges, because railway bridges (and all other subclasses of "bridge") are not counted.

How to retrieve all items, including sub-classes/sub-sub-classes/etc?
It MUST be with SPARQL.

Here is my naive query for bridges:

SELECT ?item WHERE {
    ?item wdt:P31 wd:Q12280.  # Item's type is: bridge
}

Problem: It only returns a small fraction of all bridges, because railway bridges (and all other subclasses of "bridge") are not counted.

How to retrieve all items, including sub-classes? It MUST be with SPARQL.

Here is my naive query for bridges:

SELECT ?item WHERE {
    ?item wdt:P31 wd:Q12280.  # Item's type is: bridge
}

Problem: It only returns a small fraction of all bridges, because railway bridges (and all other subclasses of "bridge") are not counted.

How to retrieve all items, including sub-classes/sub-sub-classes/etc?
It MUST be with SPARQL.

Here is my naive query for bridges in Germany:

SELECT ?item WHERE {
    ?item wdt:P31 wd:Q12280.  # Item's type is: bridge
    ?item wdt:P17 wd:Q183.    # Item's country property is: Germany
}

Problem: It only returns a hundred bridges instead of the real number which is more than a thousand because railway bridges (and all other subclasses of "bridge") are not counted.

How to retrieve all items, including sub-classes? It MUST be with SPARQL.

Here is my naive query for bridges:

SELECT ?item WHERE {
    ?item wdt:P31 wd:Q12280.  # Item's type is: bridge
}

Problem: It only returns a small fraction of all bridges, because railway bridges (and all other subclasses of "bridge") are not counted.

How to retrieve all items, including sub-classes? It MUST be with SPARQL.