Some reviewers of the XML spec grumbled darkly about this un-called-for (they said) side trip into mathe-magic. Well, while one of your co-editors will confess to a math degree, we do bandy the terms "parent element" and "child element" around an awful lot, and it's good to have it written down somewhere, with great precision, exactly what that means. Anyhow, that's our story, and we're sticking to it.
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