Man pages matching name soap::wsdl::xsd::schema::builtin in section 3pm:

SOAP::WSDL::XSD::Schema::Builtin.3pm.en	debian 10 / libsoap-wsdl-perl
SOAP::WSDL::XSD::Schema::Builtin.3pm.en	debian 11 / libsoap-wsdl-perl
SOAP::WSDL::XSD::Schema::Builtin.3pm.en	debian 12 / libsoap-wsdl-perl