what does jpp mean in the rpm file names?

[HAVENS,PETER (HP-Cupertino,ex3)]

Can someone tell me what jpp stands for in the RPM files that are available
for tomcat 4.1.12?
 
http://jakarta.apache.org/builds/jakarta-tomcat-4.0/release/v4.1.12/rpms/
<http://jakarta.apache.org/builds/jakarta-tomcat-4.0/release/v4.1.12/rpms/> 
 
The previous RPM files I was using for tomcat 4.0.3 there was no jpp in the
file name.
 
Also, I noticed that the LE version of the RPM files has dependencies on the
following two items
-          jaxp_parser_impl
-          xml-commons-apis
Can someone tell me the recommended method of satisfying these dependencies?
 
Thanks in advance.
 
-Peter