I noticed this one too late to mention in the other answer.
Spencer Dawkins writes:
5.2. Operations
...
Although the collation's substring function provides a list of
matches, a protocol need not provide all that to the client. It may
provide only the first matching substring, or even just the
information that the substring search matched.
Hmmm. I am trying to remember that you're not defining a protocol,
only describing what protocols do and don't do, but I'm trying to
read this from the application's perspective, and having a hard time
understanding how (for example) an application that is trying to
display what is matching responds when the protocol only provides an
indication that something matched. You may say this is what the
protocol developers are supposed to worry about ("if you think
applications will want to display what matches, you'd better define
the protocol so that this information is returned"), and that's OK.
I'm just struggling a bit here.
Appended text: «In this way, collations can be used with protocols that
are defined such that "x is substring of y" returns true-false.»
Arnt
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