/// <summary>
/// Creates a builder for an existential element as part of the current group element.
/// </summary>
/// <returns>Existential builder.</returns>
public ExistsBuilder Exists()
{
var builder = new ExistsBuilder();
_nestedBuilders.Add(builder);
return(builder);
}
/// <summary>
/// Adds an existential element builder to the group element.
/// </summary>
/// <param name="builder">Element builder to add.</param>
public void Exists(ExistsBuilder builder)
{
_nestedBuilders.Add(builder);
}