public Scss Concat(Scss scss2) { string resultXpath = XPathBuilder.Concat(this.Xpath, scss2.Xpath); var resultCss = string.IsNullOrEmpty(this.Css) || string.IsNullOrEmpty(scss2.Css) ? string.Empty : CssBuilder.Concat(this.Css, scss2.Css); return(new Scss(resultXpath, resultCss)); }