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Tags have to be explicitly written to a auxiliary file using the macro \gathertags .

This macro can be commented out so that the auxiliary file is not overwritten (but still accessible), thus preserving earlier work or work done on other sections in a multi-section document.

See page 51 of the ...

I've perused the BibLaTeX-package manual and answered my own question.

1. to set the delimiter between the end of the citation and the postnote text to ': ' (the default is ', '), add the following to the preamble:
\renewcommand{\postnotedelim}{: }%

2. to remove the p./pp: from preceding page ...

I am very impressed by the flexibility of the expex package for numbering examples, particularly for interlinear glossing in linguistics.

However, I cannot seem to find a specific way to refer to an example with a specific name at a position in the text before the example has been declared.

For ...

My in-line citations when page numbers are provided are not what I want them to be, and I can't figure out how to change them.

I want them to look like this:
Smith (1995: 14-16)

but they look like this:
Smith (1995, pp. 14-16)

(in other words, there should be a colon and a space separating ...