rdf_graph_property/2

Availability::- use_module(library(semweb/rdf_db)).

[nondet]rdf_graph_property(?Graph, ?Property)

True when Property is a property of Graph. Defined properties are:

hash(Hash): Hash is the (MD5-)hash for the content of Graph.
modified(Boolean): True if the graph is modified since it was loaded or rdf_set_graph/2 was called with modified(false).
source(Source): The graph is loaded from the Source (a URL)
source_last_modified(?Time): Time is the last-modified timestamp of Source at the moment the graph was loaded from Source.
triples(Count): True when Count is the number of triples in Graph.

Additional graph properties can be added by defining rules for the multifile predicate property_of_graph/2. Currently, the following extensions are defined:

library(semweb/rdf_persistency)

persistent(Boolean)
Boolean is true if the graph is persistent.