SGML on functions

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Something I've noticed is an inconsistency in the SGML markup around
functions listed in tables. Sometimes the entire function signature
is considered to be the function, and other times it's just the
function name, with its parameters outside of the <function> tags.

E.g.:

<function>variance</function>(<replaceable
class="parameter">expression</replaceable>)

vs

<function>stddev_samp(<replaceable
class="parameter">expression</replaceable>)</function>

Which way is correct?

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Thom Brown
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