Balisage Paper: The Donut of Equivalence
Joe Gollner
Managing Director
Gnostyx Research Inc.
©2024 Joe Gollner
Abstract
Balisage 2024 included a short-subject Open Microphone
session, during which conference attendees were invited give 2-10 minute presentations
on any topic relevant to the conference, including specification updates, new tool
announcements, and demonstrations. Joe Gollner discussed the donut of equivalence.
The donut of equivalence
was a solution design pattern that was introduced, along with its cheeky name, as
part of a large aerospace project (2005-2010). The idea at the time was that XML,
coupled with a scalable processing environment (that handled transformations and validations),
could be used to usher content assets and data resources back and forth amongst a
variety of different application environments. The solution was profoundly successful,
and it demonstrated that portability is king if the full value of content and data
investments is to be realized. Also showcased in this case study was the fact that
XML played only one part in a much larger solution, and its impact was, accordingly,
magnified. Two other case studies were then used to look at variations on the donut of equivalence
— each highlighting how value was realized when XML played a specialized role in
larger solutions, including in cases where it was not a welcome addition. The takeaway
of this short session is hopefully a reminder that XML, and its stack of tools and
techniques, is a relatively small player in the marketplace and that it can add tremendous
value if it finds a way to participate in larger solutions. In many ways, this talk
revisits themes from my talk of 20 years ago entitled Making Money with XML and other Unnatural Acts.