elk-reasoner/src/main/java/org/semanticweb/elk/reasoner/Reasoner.java
public synchronized Node<ElkClass> getEquivalentClassesQuietly(
			ElkClassExpression classExpression) throws ElkException {
		try {
			return getEquivalentClasses(classExpression);
		} catch (final ElkInconsistentOntologyException e) {
			// All classes are equivalent to each other, so also to owl:Nothing.
			return getTaxonomyQuietly().getBottomNode();
		}
	}
public synchronized Node<ElkClass> getEquivalentClassesQuietly(
			ElkClassExpression classExpression) throws ElkException {
		try {
			return getEquivalentClasses(classExpression);
		} catch (final ElkInconsistentOntologyException e) {
			// All classes are equivalent to each other, so also to owl:Nothing.
			return getTaxonomyQuietly().getBottomNode();
		}
	}
Return the {@code Node} containing equivalent classes of the given
{@link ElkClassExpression}. Calling of this method may trigger the
computation of the taxonomy, if it has not been done yet.

@param classExpression
the {@link ElkClassExpression} for which to return the
{@link Node}
@return the set of {@link Node} whose members are {@link ElkClass}es
equivalent to the given {@link ElkClassExpression}
@throws ElkException
if the result cannot be computed