#2 Null Values in Big Table

[Gabriel Weaver]

Rather than storing the URN components that are unassigned as empty strings, use the null value of the database.

[Gabriel Weaver]

Unfortunately, the initial googling for the GQL NULL literal does not look promising...

http://www.google.com/search?q=GQL+NULL+value&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a