Availability:
:- use_module(library(semweb/rdf_db)).
[det]rdf_register_prefix(+Prefix, 
+URI)- force(Boolean)
 - If 
true, replace existing namespace alias. Please note that replacing a namespace is dangerous as namespaces affect preprocessing. Make sure all code that depends on a namespace is compiled after changing the registration. - keep(Boolean)
 - If 
trueand Alias is already defined, keep the original binding for Prefix and succeed silently. 
Without options, an attempt to redefine an alias raises a permission error.
Predefined prefixes are: