sparql filter查询

最近使用了sparql，mark一下

select *
where
{
?eid fxbase:users dcpf:uidzhengrx;
a fxbase:UserEvent;
fxbase:deleted "F";
fxbase:has_file ?did;
dcterms:title ?title;
fxbase:startDtm ?stm;
fxbase:endDtm ?etm.
FILTER (xsd:dateTime(?stm)>xsd:dateTime("2012-08-03T07:05:00.000Z") &&
xsd:dateTime(?etm)<xsd:dateTime("2012-08-04T07:05:00.000Z")).
?doc a fxbase:Document;
fxbase:fileNm ?fileNM;
filter (?doc=?did)
}