Validate RDF/RDFS/OWL?

[Victor Porton <porton@narod.ru>]

What is the best way to validate an RDF to conform to RDFS and OWL standards?

I need this in order to write a new specification about use of RDF for describing XML namespaces.

I am a Debian Linux user. Debian provides the following packages about RDF. Which of the many to choose?

$ apt-cache search '' | grep RDF
liblicense-rdf - RDF metadata about media license choices
liblrdf0 - a library to manipulate RDF files describing LADSPA plugins
libxml-feedpp-perl - module to parse/write/merge/edit RSS/RDF/Atom syndication feeds
libxml-rss-feed-perl - Perl module for Persistent XML RSS (RDF Site Summary) Encapsulation
libxml-rss-perl - Perl module for managing RSS (RDF Site Summary) files
libarc-php - Flexible RDF system for semantic web and PHP practitioners
python-4suite-xml - An open-source platform for XML and RDF processing
libraptor1-dbg - Raptor RDF parser and serializer library - debugging symbols
libraptor1-dev - Raptor RDF parser and serializer development libraries and headers
libraptor1-doc - Documentation for the Raptor RDF parser and serializer library
libraptor1 - Raptor RDF parser and serializer library
raptor-utils - Raptor RDF parser and serializer utilities
librasqal2-dev - Rasqal RDF query library development libraries and headers
librasqal2 - Rasqal RDF query library
rasqal-utils - Rasqal RDF Query utilities
python-rdflib - RDF library containing an RDF triple store and RDF/XML parser/serializer
librdf-perl - Perl language bindings for the Redland RDF library
librdf-ruby - Ruby 1.8 language bindings for the Redland RDF library
php5-librdf - PHP5 language bindings for the Redland RDF library
python-librdf - Python language bindings for the Redland RDF library
librdf-storage-mysql - RDF library, MySQL backend
librdf-storage-postgresql - RDF library, PostGreSQL backend
librdf-storage-sqlite - RDF library, SQLite backend
librdf0-dev - Redland RDF library development libraries and headers
librdf0 - Redland Resource Description Framework (RDF) library
redland-utils - Redland Resource Description Framework (RDF) Utility programs
libsemweb1.0-cil - Semantic Web/RDF library
libsoprano-dbg - debugging symbols for the Soprano RDF framework
libsoprano-dev - development files for the Soprano RDF framework
libsoprano-doc - developer documentation for the Soprano RDF framework
libsoprano4 - libraries for the Soprano RDF framework
soprano-daemon - daemon for the Soprano RDF framework
swap-cwm - RDF/XML and RDF/N3 semantic web data processor
virtuoso-vad-rdfmappers - high-performance database - RDF mappers module

-- 
Victor Porton - http://portonvictor.org