Programmers Guide , Chap 10
http://www.postgresql.org/docs/7.3/static/xtypes.html
contrib/isbn_issn also provides an implementation example.
regds
mallah.
> Can someone point me at some detailed instructions for creating new
> datatypes..
>
> I've found quite a few web pages that mention it (in passing) and give
> brief examples - but nothing much I can actually work with for my
> purposes..
>
> Ideally I'd like to use C as the language and the datatype will need an
> 'extent' (like 'char' can be char(10) - although its nothing like a
> char field...)
>
> I'm targetting this at the new 7.4 - so I think i need to use 'version
> 1' method (using Datum etc ?)
>
> Also - the datatype itself is a comlex type which stores half a dozen
> different integers (Its a modified datetime - storing the year, month,
> day, hour, minute, second, but the extent gives it the ability to do
> YEAR TO DAY, HOUR TO SECOND etc, so you only get/set the relevant
> sections).
> When 'selected' it would return a variable length string containing the
> relevant data, and would be set by passing in a string (some of the
> data of which may well be ignored if its outside the extent of the
> column etc)
>
> Hope thats enough - all pointers greatfully received..
> (and free'd when required :)
>
>
>
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