elk-reasoner/src/main/java/org/semanticweb/elk/reasoner/stages/ClassExpressionQueryState.java
Node<ElkClass> getEquivalentClasses(
			final ElkClassExpression classExpression) throws ElkQueryException {
		final QueryState state = checkComputed(classExpression);
		return state.node;
	}
Node<ElkClass> getEquivalentClasses(
			final ElkClassExpression classExpression) throws ElkQueryException {
		final QueryState state = checkComputed(classExpression);
		return state.node;
	}
Returns {@link Node} containing all {@link ElkClass}es equivalent to the
supplied class expression, if it is satisfiable. Returns
<code>null</code> otherwise. If the class expression was not registered
by {@link #registerQuery(ElkClassExpression)} or the appropriate stage
was not completed yet, throws {@link ElkQueryException}.

@param classExpression
@return atomic classes equivalent to the supplied class expression, if it
is satisfiable, otherwise <code>null</code>.
@throws ElkQueryException
if the result is not ready