// AttributeProjection objects.
int i = 0;
for(Iterator attrs = _lev.getAttributes().iterator(); attrs.hasNext();)
{
AttributeProjection _curAttr = (AttributeProjection)attrs.next();
AttributeSourceExpression _attrMap = _dmg.CreateAttributeMap();
_attrMap.setTargetObject(_curAttr);
SourceColumn _attrCol = _attrMap.CreateSourceColumn();
_attrCol.setColumn((String)_columns.elementAt(i));
i++;
}
}