org.apache.xerces.impl.xs.XMLSchemaValidator$ValueStoreBase.contains() takes way too much time

Hi,

I¹m including some screenshots from jvisualvm showing the time spent in
parsing a rather large (19 MB) xml file in our program.
(See https://tla.mpi.nl/tools/tla-tools/elan/)

We use a Xerces SAX parser, and the overwhelming majority of the parsing
time, around 140 seconds (the total time is somewhere around 145-150
seconds) is spent in the above mentioned function
org.apache.xerces.impl.xs.XMLSchemaValidator$ValueStoreBase.contains().

Suggested in the second screenshot is that the ValueStoreBase uses a
Vector to check uniqueness of id values. Given that this will cause
quadratic time behaviour, it is no wonder that so much time is wasted!

Is there a way to replace this with a more time-efficient implementation,
short of disabling validation completely? I tried doing the latter, and
then the entire file is parsed and processed in just a few seconds.

(can you Cc any copies to me please, since I did not subscribe to this
list; the instructions at http://xerces.apache.org/xerces2-j/jira.html
don¹t say that this is required)

Thanks,
-Olaf.


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