| Access Feature content using Feature "Id".
Many FeatureCollection classes will make use of this
API to avoid unnecessary caching of content. Supporting
this interface will allow SubCollections to occur based
on FeatureIds, with a suitable improvement in memory
consumption.
For an addition improvement in memory comsumption SubCollections
may use of a sparse reprsentation where only (beginId,endId] ranges
are kept in memory.
author: Jody Garnett, Refractions Research Inc. |