How to access the Land Registry dwelling type from a SPARQL query

Question

I\'m trying to retrieve the type of dwelling from the UK Land Registry using a SPARQL query.

The API shows it\'s called property-types and shows there are four types: De

Answer 1

The answer

You just need to add the triple

?transx lrppi:propertyType ?propertytype .

to your query. For instance, here's a query based on yours:

PREFIX xsd:     
PREFIX rdf:     
PREFIX rdfs:    
PREFIX owl:     
PREFIX lrppi:   
PREFIX skos:    
PREFIX lrcommon: 

SELECT ?propertytype ?paon ?saon ?street ?town ?county ?locality ?district ?postcode ?amount ?date
WHERE {
    ?transx lrppi:pricePaid ?amount ;
            lrppi:transactionDate ?date ;
            lrppi:propertyAddress ?addr ;
            lrppi:propertyType ?propertytype .

    ?addr lrcommon:district "MALVERN HILLS"^^xsd:string .

    OPTIONAL {?addr lrcommon:county ?county .}
    OPTIONAL {?addr lrcommon:paon ?paon .}
    OPTIONAL {?addr lrcommon:saon ?saon .}
    OPTIONAL {?addr lrcommon:street ?street .}
    OPTIONAL {?addr lrcommon:town ?town .}
    OPTIONAL {?addr lrcommon:locality ?locality .}
    OPTIONAL {?addr lrcommon:postcode  ?postcode .}
}
ORDER BY ?postcode ?amount
LIMIT 10

You can copy and paste that into the endpoint and get the results. (Unfortunately, it doesn't appear that there's a way to link to the results directly.)

Finding the answer

Here's how I found that property. The endpoint has some sample queries, one of which is ”list the RDF types in use”:

PREFIX rdf:      
PREFIX rdfs:     

# Get labels for types used in the data.
SELECT  ?type ?name
WHERE {
    ?type rdfs:label ?name .
     FILTER EXISTS {  ?something rdf:type ?type . }
}

The results of that query include

---------------------------------------------------------------------------------------------------------------------------------------------
| type                                                                           | name                                                     |
=============================================================================================================================================
|                | "Property type concept"@en                               |
---------------------------------------------------------------------------------------------------------------------------------------------

Since we now now about the type we can ask for instances of it:

PREFIX rdf:      
PREFIX rdfs:     

SELECT  ?x 
WHERE { ?x a  }
LIMIT 10 

----------------------------------------------------------------
| x                                                            |
================================================================
|         |
|    |
|  |
|         |
----------------------------------------------------------------

Now we can see what's related to one of those, and by what properties. For instance

PREFIX rdf:      
PREFIX rdfs:     

SELECT  ?x ?y
WHERE { ?x ?y  }
LIMIT 10 

----------------------------------------------------------------------------------------------------------------------------------------------------------------------
| x                                                                                                         | y                                                      |
======================================================================================================================================================================
|  |  |
|  |  |
|  |  |
|  |  |
|  |  |
|  |  |
|  |  |
|  |  |
|  |  |
|  |  |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------

and we see that the property we want is , which can be shortened to lrppi:propertyType using the prefixes that you have defined. It seems to relate transactions to property types, and since the transaction in your query was ?transx, we add

?transx lrppi:propertyType ?propertyType