Accumulator use

Hello ! 

I try to cache values who are in external files referenced from my
source file : 

source.xml
------------
<root><input href="1.xml"/><input href="2.xml"/>...</root> 

n.xml
------
<root type="typeN">...</root> 

I want to create a map(xs:anyUri, xs:string), where key is the external
file URI, and value is always /*/@type in the file 

External files may be huge, and I'd like to stream them. I create an
accumulator, stream input files using this accumulator. 

<xsl:accumulator name="acc" as="map(xs:string, xs:string)"
initial-value="map{}">
   <xsl:accumulator-rule match="*[@value]">
      <xsl:sequence select="map:put($value, ./local-name(),
xs:string(./@value))"/>
   </xsl:accumulator-rule>
</xsl:accumulator> 

<xsl:mode name="m" streamable="yes"/> 

<xsl:template match="/">
   <xsl:stream href="../../test/resources/entries.xml"
use-accumulators="acc">
      <xsl:apply-templates mode="m"/>
   </xsl:stream>
   <!-- do here something that uses the accumulator -->
</xsl:template> 

How can I access to the accumulator after stream processing ? I'd like
to write the map content to the output. Is it possible ? 

Best regards, 

Christophe