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我从gov 网站获得了以下 SPARQL 查询：

prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix owl: <http://www.w3.org/2002/07/owl#>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>
prefix sr: <http://data.ordnancesurvey.co.uk/ontology/spatialrelations/>
prefix ukhpi: <http://landregistry.data.gov.uk/def/ukhpi/>
prefix lrppi: <http://landregistry.data.gov.uk/def/ppi/>
prefix skos: <http://www.w3.org/2004/02/skos/core#>
prefix lrcommon: <http://landregistry.data.gov.uk/def/common/>

# Returns the Price Paid data from the default graph for each transaction record having
# an address with the given postcode.
# The postcode to query is set using SPARQL 1.1's 'values' clause

SELECT ?paon ?saon ?street ?town ?county ?postcode ?amount ?date ?category
WHERE
{
  VALUES ?postcode {"PL6 8RU"^^xsd:string}

  ?addr lrcommon:postcode ?postcode.

  ?transx lrppi:propertyAddress ?addr ;
          lrppi:pricePaid ?amount ;
          lrppi:transactionDate ?date ;
          lrppi:transactionCategory/skos:prefLabel ?category.

  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}
}
ORDER BY ?amount

目前它只检索邮政编码 = PL6 8RU 的记录。我想检索邮政编码以“PL6”开头的所有记录。有任何想法吗？

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