xsl behaviour

[Tim Cronin <ti...@13-colonies.com>]

given the following Stylesheet

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/">
  <FONT>
    <xsl:apply-templates select="/Properties/Group[@Name='Data
Properties']/Datum[@Name='Font']/Font"/>
    <xsl:attribute name="color"><xsl:if
test="Datum[@Name='QuantityShort']&lt;0">Red</xsl:if></xsl:attribute>
    <xsl:value-of select="Datum[@Name='QuantityOnOrder']"/>
  </FONT>
  </xsl:template>
  <xsl:template match="Font">
    <xsl:attribute name="face"><xsl:value-of
select="@Family"/></xsl:attribute>
    <xsl:attribute name="color"><xsl:value-of
select="@Color"/></xsl:attribute>
    <xsl:attribute name="style">font-size:<xsl:value-of select="@Size"/>;
font-style:<xsl:value-of select="@Style"/>;font-weight:<xsl:value-of
select="@Weight"/>;</xsl:attribute>
  </xsl:template>
</xsl:stylesheet>

I get a transformation warning saying that "Attribute color is outside of
element"
refering to this line:
<xsl:attribute name="color"><xsl:if
test="Datum[@Name='QuantityShort']&lt;0">Red</xsl:if></xsl:attribute>

the problem is within the font section
  <FONT>
    <xsl:apply-templates select="/Properties/Group[@Name='Data
Properties']/Datum[@Name='Font']/Font"/>
    <xsl:attribute name="color"><xsl:if
test="Datum[@Name='QuantityShort']&lt;0">Red</xsl:if></xsl:attribute>
    <xsl:value-of select="Datum[@Name='QuantityOnOrder']"/>
  </FONT>

under MS this worked OK... 
should I be able to do this?