Unlike all other DOM parsers, eXtc is not memory-based. eXtc's DOMs are mapped directly into the underlying MUMPS/Caché database structures (known as globals), so there is no limit to the size of XML document that can be parsed and stored within eXtc.

Also unlike memory-resident DOM parsers, eXtc's performance does not degrade as document size increases. With eXtc you get close to the performance of a SAX parser without any the limitations of a SAX parser, but you get all the benefits of a DOM parser without any of the traditional disadvantages.