Here is a list of all namespaces with brief descriptions:

boost	Boost libraries.
boost::logic
iobind
iobind::parser
std
std::tr1
str	String related utilities and Regular expression matching
zypp	Easy-to use interface to the ZYPP dependency resolver
zypp::_ExternalProgram
zypp::_logtoolsdetail
zypp::applydeltarpm	Namespace wrapping invocations of /usr/bin/applydeltarpm
zypp::base
zypp::base::logger
zypp::base::safebool_detail
zypp::base::sysconfig
zypp::bit
zypp::bit::bit_detail
zypp::callback	Callbacks light
zypp::debug
zypp::detail
zypp::env
zypp::exception_detail
zypp::externalprogram
zypp::filesystem	Types and functions for filesystem operations
zypp::filter
zypp::functor
zypp::functor::functor_detail	An unary functor forwarding to some other `_Functor &`
zypp::gettext
zypp::gzstream_detail
zypp::HACK
zypp::iostr	Iostream related utilities
zypp::kvmap
zypp::log
zypp::media
zypp::misc
zypp::packagedelta
zypp::parser
zypp::parser::plaindir
zypp::parser::susetags
zypp::parser::ws
zypp::parser::yum
zypp::pool
zypp::range_detail
zypp::repo
zypp::repo::susetags
zypp::repo::yum
zypp::resfilter
zypp::resstatus
zypp::rw_pointer	Don't forgett to provide versions for _Ptr and _constPtr, esp
zypp::sat	Libsolv interface
zypp::sat::detail
zypp::sat::solvitermixin_detail
zypp::solver
zypp::solver::detail
zypp::str	String related utilities and Regular expression matching
zypp::syscontent
zypp::target
zypp::target::hal
zypp::target::rpm
zypp::thread
zypp::traits
zypp::ui
zypp::ui::selfilter
zypp::url	Url details namespace
zypp::ws
zypp::xml
zypp::xml::parse_def_assign	parseDefAssign exposed details
zypp::zypp_detail
zypp::zypp_readonly_hack