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Re: stem structure

Chronological Thread 
  • From: Shilen Patel <>
  • To: Tom Barton <>
  • Cc:
  • Subject: Re: stem structure
  • Date: Tue, 10 Jul 2007 12:14:09 -0400

Tom Barton wrote:
I'm going to start using more specific subject lines to start separate threads as we continue to delve into the issues raised by Shilen...

Shilen Patel wrote:
The import file is 230 MB (from the 1.1 Grouper export). There are
846,102 memberships, 102,093 groups, and 89,514 stems.

I'm curious about the nearly 1-1 ratio of stems to groups. What's your stem structure look like, and when do you decide to create a stem vs create a group?

About 99% of our stems and groups and 50% of our memberships are from class data. The rest is almost all from the dynamic groups.

Our class data groups are formated like the following: duke:siss:courses:<SUBJECT>:<CATALOG NUMBER>:<SECTION NUMBER>:<CLASS NUMBER>:<TERM NUMBER>:<instructors or TAs or students>. So the subject, catalog number, section number, class number, and term number are stems. Most of the stems were probably created with the first year of classes and as the number of years of classes increases, the stems to groups ratio will no longer be around 1-1.

I'm curious. Do you anticipate using this stem structure to differentiate among people with STEM or CREATE privileges, to facilitate browsing through the mass of course groups, and/or is it a way of affixing an appropriate attribute value to a course group?

The primary reasons for the stem structure is to facilitate browsing through the courses and to provide enough information in the group name to uniquely identify the course. The stem structure also allows us to cleanly have multiple groups per course.

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