[TYPO3-dev] What is the purpose of sysexts?

[Michael Stucki]

Hi Niels,

> While following the threads about adding some extensions as sysexts in
> the core and dev newsgroups I asked myself what the purpose of those
> sysexts is.
> 
> I'm aware between the differences of local, global and system extensions
> but while following the discussions mentioned above I asked myself
> whether there is a definition of the purpose of sysexts.

An extension qualifies as a system extension if it is used by at least 
80% of all installations.

Most parts of this selection were made during TYPO3 4.0 development, but 
I think it is still accurate for current verions.

The only exception in this row is the adodb/dbal couple. The reason for 
including them as system extensions was that it is not easily possible 
to install TYPO3 on e.g. MSSQL without taking a MySQL database at help 
(extension manager depends on a database, otherwise it could not fetch 
the "dbal" extension...).

- michael
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