Re: design question on function namespaces

The thinking here is that it's often useful to create a library of reusable
functions that compute derived data from your source document: for example,
"does this chapter have any footnotes" or "how many columns are there in
this table" or "is this employee in the pension scheme" or "get all the
products that this customer has bought". You should think of these as
methods associated with the element in question (even though there's no
encapsulation or inheritance), and recognize the link between code and data
by matching up the namespace.

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