[xsl] number + document

[abbouh <abbouh@xxxxxxxxxxxxxxxxx>]

i want to use nuber for each "ht" node in several document
so i use this xsl file:
<xsl:for-each select="//doccontent/chapmod">
<xsl:for-each
select="document(concat(string(./attribute::docref),'.xml'))//ht">
<xsl:choose>
....
<xsl:number level="multiple"  count="chap1|chap2|chap3" format="A.1"/>
..
<xsl:value-of select="."/>
..
</xsl:for-each>
</xsl:for-each>

and receive this output:

A title1
A title2
    A.1 paragraph1
      A.1.1 ss-paragraph1
      A.1.2 ss-paragraph2
      A.1.3 ss-paragraph3
    A.2 paragraph2
A title3


but what i want to get is:

A title1
B title2
    B.1 paragraph1
      B.1.1 ss-paragraph1
      B.1.2 ss-paragraph2
      B.1.3 ss-paragraph3
    B.2 paragraph2
C title3

any idea,
thanks


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