## setMapping(customXmlPart, Xpath, prefixMapping) {#customxmlpart_string_string} Sets a mapping between the parent structured document tag and an XML node of a custom XML data part. ```js setMappi......## setMapping(customXmlPart, xPath, prefixMapping) {#customxmlpart_string_string}...Words.Markup.CustomXmlPart, xPath: string, prefixMapping: string)...