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RE: [xsl] XSL resources - Flat to hierarchy - Common ancestors

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*3. Common ancestors*

Well, your warning about not knowing it all was pretty apt

1. I can't understand how xsl:variable can be static, seems like a
contradiction?

2. I couldn't get my head round your example, and I've been trying
different solutions without much success, but I figure what I need now
is understanding more than code. So here goes for a few questions.

My idea to solve this one was,
Given that I will pass in the MenuId, I create a global param:
<xsl:param name="MenuId" select="'198'"/>

a). I copy the root and get the Menu that corresponds to my MenuId:
<xsl:template match="/Menus">
	<xsl:element name="Menus">
		<xsl:apply-templates select="//Menu[@MenuId = $MenuId]"
mode="ABC"/>
	</xsl:element">
</xsl:template>

b). I get the node set of ancestors-or-self of this menu:
<xsl:template match="Menu" mode="ABC">
	<xsl:apply-templates select="ancestor-or-self::Menu"
mode="DEF"/>
</xsl:template>

c). I copy each of these menus, and any of its children (but not
grandchildren):
<xsl:template match="Menu" mode="DEF">
    <xsl:copy>
      <xsl:copy-of select="@* | child::Menu"/>
    </xsl:copy>
</xsl:template>

But there's still something not right.
1) do the nodes returned by ancestor-or-self retain their hierarchy?
2) when I do an apply templates on ancestor-or-self, do they 'remember'
the rest of the document, ie. Can the called template access their
children etc.?
3) Why do I need the ::Menu?
4) Why does child::Menu seem to return all the descendants and not just
the first generation?

Here's some data to test on:
<Menus>
  <Menu MenuId="23">
    <Menu MenuId="42"/>
    <Menu MenuId="84">
      <Menu MenuId="198">
        <Menu MenuId="53"/>
      </Menu>
      <Menu MenuId="23">
        <Menu MenuId="84"/>
      </Menu>
    </Menu>
    <Menu MenuId="65"/>
  </Menu>
  <Menu MenuId="47">
    <Menu MenuId="85">
      <Menu MenuId="79"/>
    </Menu>
  </Menu>
</Menus>

The expected result set should be:
<Menus>
  <Menu MenuId="23">
    <Menu MenuId="42"/>
    <Menu MenuId="84">
      <Menu MenuId="198">
        <Menu MenuId="53"/>
      </Menu>
      <Menu MenuId="23"/>
    </Menu>
    <Menu MenuId="65"/>
  </Menu>
</Menus>

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