What Is An Outline, part 3
Feb 02, 2004
Iron Lute

In my previous post, I concentrated on extending our data model to
handle multiple data sources cleanly and transparently. However, we
now have a conceptual contradiction in our data model. To this point,
the data model we've built still assumes it is a tree, which means we
can use the tree-optimized algorithms for things like counting
children. But if a document transcludes something that transcludes the
original, we can have a cycle, which means there is a path starting
with a node in the original, going through the transcluded document,
and ending up back at the original node. Most tree-based algorithms
respond to this situation by infinitely looping, which manifests itself
as a hard lock-up, which is generally considered a negative by

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