/// <summary>
 /// Enter a parse tree produced by <see cref="BibleReferenceParser.reference"/>.
 /// <para>The default implementation does nothing.</para>
 /// </summary>
 /// <param name="context">The parse tree.</param>
 public override void EnterReference([NotNull] BibleReferenceParser.Grammar.Generated.BibleReferenceParser.ReferenceContext context)
 {
     ReferenceRangeBuilder = new BibleReferenceRangeBuilder();
     ReferenceBuilder      = new BibleReferenceBuilder();
     References            = new List <BibleReferenceRange>();
 }
 public void Reset()
 {
     ReferenceRangeBuilder = null;
     ReferenceBuilder      = null;
     References            = null;
 }