System.Xml.Serialization.XmlSchemaImporter.GetTypeItems C# (CSharp) Method

        private TypeItems GetTypeItems(XmlSchemaType type)
        {
            TypeItems items = new TypeItems();
            if (type is XmlSchemaComplexType)
            {
                XmlSchemaParticle particle = null;
                XmlSchemaComplexType ct = (XmlSchemaComplexType)type;
                if (ct.ContentModel != null)
                {
                    XmlSchemaContent content = ct.ContentModel.Content;
                    if (content is XmlSchemaComplexContentExtension)
                    {
                        XmlSchemaComplexContentExtension extension = (XmlSchemaComplexContentExtension)content;
                        items.Attributes = extension.Attributes;
                        items.AnyAttribute = extension.AnyAttribute;
                        particle = extension.Particle;
                    }
                    else if (content is XmlSchemaSimpleContentExtension)
                    {
                        XmlSchemaSimpleContentExtension extension = (XmlSchemaSimpleContentExtension)content;
                        items.Attributes = extension.Attributes;
                        items.AnyAttribute = extension.AnyAttribute;
                        items.baseSimpleType = extension.BaseTypeName;
                    }
                }
                else
                {
                    items.Attributes = ct.Attributes;
                    items.AnyAttribute = ct.AnyAttribute;
                    particle = ct.Particle;
                }
                if (particle is XmlSchemaGroupRef)
                {
                    XmlSchemaGroupRef refGroup = (XmlSchemaGroupRef)particle;
                    items.Particle = FindGroup(refGroup.RefName).Particle;
                    items.IsUnbounded = particle.IsMultipleOccurrence;
                }
                else if (particle is XmlSchemaGroupBase)
                {
                    items.Particle = (XmlSchemaGroupBase)particle;
                    items.IsUnbounded = particle.IsMultipleOccurrence;
                }
            }
            return items;
        }