Declarative Objectivity (DO) Language : Data Clauses : FROM Clause
FROM Clause
A FROM clause identifies the query source (sequence of objects) from which to return values, as requested by the RETURN Statement.
fromClause : FROM source;
Used In 
RETURN Statement
Quick Look 
Return the postal code for a particular customer:
FROM Customer WHERE lastName == 'Smith' RETURN address.postalCode;
The source for a FROM clause is specified by a schema class; the source is the group of persistent objects that instantiate the class.