[xsl] Are xsl:accumulator-rules exclusive ?

Hello,

I didn't manage to find the response in the specs, so...

Are xsl:accumulator-rule mutually exclusives, and do default priorities 
for template rules apply in accumulator-rule ? Is the same node able to 
fire many xsl:accumulator-rule in the same mode, if evaluated only once ?
For example, if I have this accumulator :

  <xsl:accumulator name="weight" as="xs:integer" initial-value="0">
    <xsl:accumulator-rule match="box[xs:integer(@width) gt 
100][xs:integer(@height) gt 100]" select="$value + 100"/>
    <xsl:accumulator-rule match="box[xs:integer(@width) gt 
50][xs:integer(@height) gt 50]" select="$value + 50"/>
    <xsl:accumulator-rule match="box" select="$value + 1"/>
  </xsl:accumulator>
  <xsl:mode use-accumulators="#all" on-no-match="shallow-copy"/>

  <xsl:template name="xsl:initial-template">
    <xsl:variable name="content" as="element(box)*">
      <box width="150" height="150"/>
    </xsl:variable>
    <xsl:apply-templates select="$content"/>
  </xsl:template>


I'd expect to get <box width="150" height="150">100</box> but I get <box 
width="150" height="150">1</box>.
Is it normal ?

Should I put a xsl:choose in the rule match="box" and evaluate all 
possibilities inside the choose ?
Best regards,
Christophe
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