public void ImportDocumentTest2()
        {
            MeiDocument testDoc = MeiImport.ImportDocument("..\\..\\files\\MeiImportTest2.xml");

            Assert.IsNotNull(testDoc.SchemaLocation);
            Assert.IsNotNull(from node in testDoc.Nodes().OfType <XProcessingInstruction>() select node.Target != "xml-model");
        }
        public void ImportDocumentTest3()
        {
            MeiDocument testDoc = MeiImport.ImportDocument("..\\..\\files\\MeiImportTest3.xml");

            IEnumerable <XProcessingInstruction> models = from node in testDoc.Nodes().OfType <XProcessingInstruction>().Where(node => node.Target == "xml-model") select node;

            List <string> href_compare = new List <string>();

            Match hrefs;

            foreach (XProcessingInstruction model in models)
            {
                //Get schemaLocation from pImodel.Data
                //See example here: https://msdn.microsoft.com/de-de/library/t9e807fx(v=vs.110).aspx

                string HRefPattern = "href\\s*=\\s*(?:[\"'](?<1>[^\"']*)[\"']|(?<1>\\S+))";

                try
                {
                    hrefs = Regex.Match(model.Data, HRefPattern,
                                        RegexOptions.IgnoreCase | RegexOptions.Compiled,
                                        TimeSpan.FromSeconds(1));
                    while (hrefs.Success)
                    {
                        href_compare.Add(hrefs.Groups[1].ToString());
                        hrefs = hrefs.NextMatch();
                    }
                }

                catch (RegexMatchTimeoutException)
                {
                    break;
                }
            }

            Assert.AreEqual(testDoc.SchemaLocation, string.Empty);
            CollectionAssert.AllItemsAreUnique(href_compare);
        }