BlogEngine.Core.Web.HttpHandlers.Foaf.WriteFoafPerson C# (CSharp) Method

        private void WriteFoafPerson(XmlWriter writer, FoafPerson person)
        {
            writer.WriteStartElement("foaf", "Person", null);

            // if (person.ID != "")
            // {
            // writer.WriteAttributeString("rdf", "ID", null, person.ID);
            // }
            writer.WriteElementString("foaf", "name", null, person.Name);
            if (person.Title != string.Empty)
            {
                writer.WriteElementString("foaf", "title", null, person.Title);
            }

            if (person.Firstname != string.Empty)
            {
                writer.WriteElementString("foaf", "givenname", null, person.Firstname);
            }

            if (person.Lastname != string.Empty)
            {
                writer.WriteElementString("foaf", "family_name", null, person.Lastname);
            }

            if (!string.IsNullOrEmpty(person.Email))
            {
                writer.WriteElementString("foaf", "mbox_sha1sum", null, CalculateSha1(person.Email, Encoding.UTF8));
            }

            if (!string.IsNullOrEmpty(person.Homepage))
            {
                writer.WriteStartElement("foaf", "homepage", null);
                writer.WriteAttributeString("rdf", "resource", null, person.Homepage);
                writer.WriteEndElement();
            }

            if (!string.IsNullOrEmpty(person.Blog))
            {
                writer.WriteStartElement("foaf", "weblog", null);
                writer.WriteAttributeString("rdf", "resource", null, person.Blog);
                writer.WriteEndElement();
            }

            if (person.Rdf != string.Empty && person.Rdf != HttpContext.Current.Request.Url.ToString())
            {
                writer.WriteStartElement("rdfs", "seeAlso", null);
                writer.WriteAttributeString("rdf", "resource", null, person.Rdf);
                writer.WriteEndElement();
            }

            if (!string.IsNullOrEmpty(person.Birthday))
            {
                writer.WriteElementString("foaf", "birthday", null, person.Birthday);
            }

            if (!string.IsNullOrEmpty(person.PhotoUrl))
            {
                writer.WriteStartElement("foaf", "depiction", null);
                writer.WriteAttributeString("rdf", "resource", null, person.PhotoUrl);
                writer.WriteEndElement();
            }

            if (!string.IsNullOrEmpty(person.Phone))
            {
                writer.WriteElementString("foaf", "phone", null, person.Phone);
            }

            if (person.Friends != null && person.Friends.Count > 0)
            {
                foreach (var friend in person.Friends)
                {
                    writer.WriteStartElement("foaf", "knows", null);

                    this.WriteFoafPerson(writer, friend);

                    writer.WriteEndElement(); // foaf:knows
                }
            }

            writer.WriteEndElement(); // foaf:Person
        }