Adds a triple to the specified graph of this dataset
@param s the subject for the triple
@param p the predicate for the triple
@param value the value of the literal object for the triple
@param datatype the datatype of the literal object for the triple (null values will default to xsd:string)
@param graph the graph to add this triple to
@param language the language of the literal object for the triple (or null)
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