public void AddQualitySpecification(XmlQualitySpecification xmlQualitySpecification)
        {
            if (QualitySpecifications == null)
            {
                QualitySpecifications = new List <XmlQualitySpecification>();
            }

            QualitySpecifications.Add(xmlQualitySpecification);
        }
        public void AddQualitySpecification(
            [NotNull] XmlQualitySpecification xmlQualitySpecification)
        {
            Assert.ArgumentNotNull(xmlQualitySpecification, nameof(xmlQualitySpecification));

            if (QualitySpecifications == null)
            {
                QualitySpecifications = new List <XmlQualitySpecification>();
            }

            QualitySpecifications.Add(xmlQualitySpecification);
        }