bind named queries to methods

[mhgrove]

Alibaba in sesame has this sort of system:

@sparql("SELECT ?member "+
"WHERE { $this eg:bloodPressureHistory ?member . " +
" ?member eg:measurementDate ?date } ORDER BY ?date")
public abstract Result findBloodPressureByDate();

calling that method will execute that query. might be a useful non-JPA specific feature to add, though we can probably overload using namedqueries for this stuff