private static string ConvertCollectionToString(ICollection <XName> names)
        {
            StringBuilder builder = new StringBuilder();

            foreach (var name in names)
            {
                var ns = SrcMLNamespaces.LookupPrefix(name.Namespace.NamespaceName);
                builder.AppendFormat(", {0}:{1}", ns, name.LocalName);
            }
            builder.Remove(0, 2);
            return(builder.ToString());
        }
        /// <summary>
        /// Gets an XPath query that uniquely identifies the given XElement
        /// </summary>
        /// <param name="element">The element to create an XPath query for</param>
        /// <param name="relativeToFileUnit">whether or not the XPath query is relative to the parent file unit or not</param>
        /// <returns>An XPath query that uniquely identifies <paramref name="element"/></returns>
        public static string GetXPath(this XElement element, bool relativeToFileUnit)
        {
            if (null == element)
            {
                throw new ArgumentNullException("element");
            }

            StringBuilder xpathBuilder = new StringBuilder();

            XElement current = element;

            do
            {
                if (SRC.Unit == current.Name)
                {
                    if (relativeToFileUnit)
                    {
                        current = null;
                        continue;
                    }
                    var fileName = current.Attribute("filename");
                    if (fileName != null)
                    {
                        xpathBuilder.Insert(0, String.Format(CultureInfo.InvariantCulture, "[@filename=\"{0}\"]", fileName.Value));
                    }
                }
                else
                {
                    var count = current.ElementsBeforeSelf(current.Name).Count() + 1;
                    xpathBuilder.Insert(0, String.Format(CultureInfo.InvariantCulture, "[{0}]", count));
                }

                var prefix = SrcMLNamespaces.LookupPrefix(current.Name.NamespaceName);


                xpathBuilder.Insert(0, String.Format(CultureInfo.InvariantCulture, "{0}", current.Name.LocalName));
                if (!String.IsNullOrEmpty(prefix))
                {
                    xpathBuilder.Insert(0, String.Format(CultureInfo.InvariantCulture, "{0}:", prefix));
                }
                xpathBuilder.Insert(0, "/");
                current = (null == current.Parent ? null : current.Parent);
            } while(null != current);
            return(xpathBuilder.ToString());
        }