我正在尝试从dbpedia进行完美的sparql查询，以获取特定出生国家/地区的所有足球运动员的职业信息，例如：
birthCountry | player | birthDate | year | team | matches | goals
目前，我设法执行了无法满足我需求的查询
select ?birthCountry ?player ?birthDate ?year ?team ?matches ?goals where {
?player a dbo:SoccerPlayer ;
dbo:birthPlace/dbo:country ?birthCountry ;
dbo:birthDate ?birthDate ;
dbo:careerStation ?station .
?station dbo:years ?year ;
dbo:team/rdfs:label ?team ;
dbo:numberOfMatches ?matches ;
dbo:numberOfGoals ?goals .
filter (langMatches(lang(?team), "EN"))
filter (?birthCountry in (dbr:England))
}
order by ?player ?year
问题是由于某些我不理解的出生日期格式，我得到了副本：
birthCountry | player | birthDate | year | team | matches | goals
-----------------------------------------------------------------------------------------------------------------------------
:England [http] | :AJ_George [http] | "1996-12-06"^^xsd:date | "2014"^^xsd:gYear | "Banbury United F.C."@en | 4 | 0
:England [http] | :AJ_George [http] | "1996-12-6"^^xsd:date | "2014"^^xsd:gYear | "Banbury United F.C."@en | 4 | 0
:England [http] | :AJ_George [http] | "1996-12-06"^^xsd:date | "2014"^^xsd:gYear | "Oxford United F.C."@en | 2 | 0
:England [http] | :AJ_George [http] | "1996-12-6"^^xsd:date | "2014"^^xsd:gYear | "Oxford United F.C."@en | 2 | 0
预先感谢您的帮助！