[Gmod-schema] chado map module

[Sook J. <so...@gm...>]

Hello,
I have  a question about map module.

The description of featurerange table below mentions leftendf and
rightstartf but there are no fields in the actual table. Are there supposed
to be more fields such as leftendf, rightstartf, (even leftstartf and
rightendf)?

http://gmod.org/wiki/Chado_Map_Module
"In cases where the start and end of a mapped feature is a range, leftendf
and rightstartf are populated. leftstartf_id, leftendf_id, rightstartf_id,
rightendf_id are the ids of features with respect to which the feature is
being mapped."

I'm trying to model QTL with a linkage group, start and end. How can this be
modeled in featurerange - featuremap_id for the map, feature_id for the QTL,
leftstartf_id for the linkage group and rightendf_id for the same linkage
group (since this field is NOT NULL)? Then where does the actual position
(start and end) go? To the leftendf and rightstartf if those fields do
exist? If this table (featurerange) is designed for specific data such as
cytological bands, wouldn't it be nice to have start and end instead of
mappos in featurepos table?

 Thanks!

Sook