I think you just want

<xsl:key

  <xsl:template match="/*">

    <page>

      <title><xsl:value-of select="MyTitle" /></title>

      <content>
        <div class="Image">
          <xsl:value-of select="document('en-US.xml')//i18n:language/i18n:hash-list/i18n:string[@key='1']"/>
          <img>
            <xsl:attribute
name="href">http://www.example.com/img.gif</xsl:attribute>
            <xsl:attribute name="alt">
          <xsl:value-of select="document('en-US.xml')//i18n:language/i18n:hash-list/i18n:string[@key='2']"/>
            </xsl:attribute>
          </img>
        </div>
      </content>

    </page>

  </xsl:template>

so long as you declare a namespace for the i18n prefix (in both your
stylesheet and en-us.xml file)

David

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