(session add="username")<qd>username</qd>(/session)
would result in the string "<qd>username</qd>" getting added to the session data under the tag username. this wouldnt happen with [ses<qd , <ses<qd or <ses(qd which would all work fine... <ses[qd would also break however [ses[qd and [ses(qd would work fine.
its hard to think up examples of incorrect nesting, typically the brackets will all be < type and the normal nesting follows, the other two are just special cases where some bits of code have to be run out of the normal order. for instance a plugin to manipulate a server side file prior to allowing another plugin to read it and display its contents. (btw i got some nice caching on my implementation to avoid unneeded server disk writes)
additional ; another thought;
<case c="<mem>ref</mem>">
<1>
(insertfile...
</1>
<2>
(deletefile...
</2>
</case>
this case statement does both cases before deciding which to do! if you turn the brackets around and give (case(mem, it works correctly.
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