XOM API for Processing XML with Java

[Wolfgang Hoschek <whoschek AT lbl.gov>]

> > It doesn't occur in my use cases, but if one had an app that 
> > exchanges many identically formed small XML protocol messages and 
> > that app happened to use internal DTD subsets it would take a large 
> > hit. So more immediately useful than a ThreadLocal is a small string 
> > cache similar in spirit to Verifier.URICache. I think that should 
> > eliminate problems for all but bizarre use cases. Checking for a 
> > cache hit with == doesn't make much sense here; one needs to check 
> > with equals(). I think keeping the same cache size (6) is just fine.
>
> This would on;y help if the internal DTD subsets, and therefore likely 
> the whole DocTypes were the same across many messages.

Sure, but if there's a common case, that's the one.

> In this case (frequent reuse of the same DTD) you could just make one 
> DocType and keep copying it with the copy constructor, which bypasses 
> the check, I should probably add a note about this (and similar 
> techniques) to the FAQ.

Sure, by why have the user figure out a non-obvious trick the hard way?

Wolfgang.