http://spinrdf.org/sp#Variable
Class sp:Variable

rdf:type
rdfs:Class
rdfs:comment
A variable mentioned in a Triple or expression. Variables are often blank nodes with the variable name stored in ts:name. Variables can also be supplied with a URI in which case the system will attempt to reuse the same variable instance across multiple query definitions.
rdfs:label
Variable
rdfs:subClassOf
sp:SP System class
Instances
sp:_age, sp:_b, sp:_cardinality, sp:_class, sp:_count, sp:_datatype, sp:_error, sp:_found, sp:_hasValue, sp:_label, sp:_max, sp:_maxCount, sp:_min, sp:_minCount, sp:_minCount2, sp:_ns, sp:_object, sp:_optional, sp:_p, sp:_predicate, sp:_property, sp:_range, sp:_rdf, sp:_restriction, sp:_someValuesFrom, sp:_str, sp:_t, sp:_type, sp:_value, sp:_valueType, spin:_arg1, spin:_arg2, spin:_arg3, spin:_arg4, spin:_arg5, spin:_this

References

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