Marklogic如何将文档保存到文件系统中的单个xml中

Question

Qconsole返回多个文档节点。但不知道如何将文件系统中的所有文档节点保存到单个xml文件中。我不知道为什么它只保存最后一个文件。 ; - （（提前致谢。

我的示例源代码。

(:validate condition and concate values:)
declare function local:ifx($mnem,$val) as node()* {
   if(fn:exists($val)) 
   then xdmp:value(fn:concat("<meta name=""{$mnem}"" content=""",$val,""" />")) 
else ()
};

(:Loop and concat values:)
declare function local:forx($mnem,$vals) as node()* {
   for $val in $vals
       return xdmp:value(fn:concat("<meta name=""{$mnem}"" content=""",$val,""" />"))
};


declare function local:ETL($nodes as node()*) as node()*{

  for $n in $nodes
      let $v_id := $n/rec:record/meta:Metadata/meta:id
      let $v_ba := for $elem in $n/rec:record/meta:Metadata/meta:fundingSource
                      return if (fn:string-length($elem/meta:BugetCode/meta:code)= 1)
                            then fn:concat("0",$elem/meta:BugetCode/meta:code)
                            else $elem/meta:BugetCode/meta:code
  return
     <record url="dbfeed.iadb" mimetype="text/html" last-modified="NA">
          <metadata>
              {local:ifx("id",$v_id)}
              {local:forx("ba",$v_ba)}
          </metadata> 
      </record>
     )

};

(:find all documents within a year:)
let $docs := cts:search(
fn:doc(),
    cts:and-query((
                  cts:element-value-query(xs:QName("meta:Collection"),"EDS"),
                  cts:field-range-query("rd",">=","2016-01-01"),
                  cts:field-range-query("rd","<","2017-01-01")
                  ))
)

let $XML2016 :=
       for $i in (local:uredetl($docs))
       return $i

 return xdmp:save("/output/all-data-2016.xml") ,$XML2016)