How to use

isSubsetInternal

method

in

org.openrdf.model.util.Models

/**
 * Compares two RDF models, and returns <tt>true</tt> if the first model is a
 * subset of the second model, using graph isomorphism to map statements
 * between models.
 */
public static boolean isSubset(Set<? extends Statement> model1, Set<? extends Statement> model2) {
  // Compare the number of statements in both sets
  if (model1.size() > model2.size()) {
    return false;
  }
  return isSubsetInternal(model1, model2);
}

/**
 * Compares two RDF models, and returns <tt>true</tt> if they consist of
 * isomorphic graphs and the isomorphic graph identifiers map 1:1 to each
 * other. RDF graphs are isomorphic graphs if statements from one graphs can
 * be mapped 1:1 on to statements in the other graphs. In this mapping, blank
 * nodes are not considered mapped when having an identical internal id, but
 * are mapped from one graph to the other by looking at the statements in
 * which the blank nodes occur.
 * <p>
 * A Model can consist of more than one graph (denoted by context
 * identifiers). Two models are considered isomorphic if for each of the
 * graphs in one model, an isomorphic graph exists in the other model, and
 * the context identifiers of these graphs are either identical or (in the
 * case of blank nodes) map 1:1 on each other.
 * 
 * @see <a href="http://www.w3.org/TR/rdf11-concepts/#graph-isomorphism">RDF
 *      Concepts &amp; Abstract Syntax, section 3.6 (Graph Comparison)</a>
 * @since 2.8.0
 */
public static boolean isomorphic(Iterable<? extends Statement> model1,
    Iterable<? extends Statement> model2)
{
  Set<? extends Statement> set1 = toSet(model1);
  Set<? extends Statement> set2 = toSet(model2);
  // Compare the number of statements in both sets
  if (set1.size() != set2.size()) {
    return false;
  }
  return isSubsetInternal(set1, set2);
}