(from paw)

  Question: What is synonymous to the Debian Package apache2 in RedHat? 
  Answer: httpd, they are both binaries of the Apache http Server from the Apache Software Foundation 

Did you know that these packages are equivalent?

  libxml-parser-perl == perl-XML-Parser 
  libxml-sax-perl == perl-XML-SAX 
  apache2 == httpd 
  libpcre3 == pcre 
  libldap2 == openldap 
  gs-gpl == GNU Ghostscript 

This is a question of ontology; this is probably bigger than FOSSology, and would require more participation from communities, organizations, corporations, etc.

Question: Is the Debian package “alias” info sufficient for this requirement? (RPM spec files also have this, I think)