internal XML parser used in Solr

[Smith G]

Hello ,
         There are some project specific schema xml files which should
be parsed. I have used Jdom API for the same. But it seems more clean
to shift to xml parser used by Solr itself. I have gone through source
codes.Its a bit confusing. I have found javax.xml package and also
org.xml.sax package . May I know which API should I use so that there
is no need to add some external jar file to the solr-lib . I am also
looking for the jar file ( in solr ) in which xml parser api is
included.
Thanks