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[xsl] format-number issue in XSLT 1.0

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I'd like to get a ruling from the experts on Xalan conformance test numberformat31:

<xsl:decimal-format minus-sign="_" />

<xsl:template match="doc">
<out>
<xsl:value-of select="format-number (-26931.4,'###,###.###;###,###.###')"/>
</out>
</xsl:template>

Xalan 2.6 emits

<out>_26,931.4</out>

..while Saxon emits

<out>26,931.4</out>

After referencing the JDK 1.1 specification for DecimalFormat, I noticed this:

If there is an explicit negative subpattern, it serves only to specify the negative prefix and suffix; the number of digits, minimal digits, and other characteristics are all the same as the positive pattern. That means that "#,##0.0#;(#)" produces precisely the same behavior as "#,##0.0#;(#,##0.0#)".

Doesn't this mean that the default prefix of "_" should not be used because the explicit negative subpattern declared an empty prefix and suffix?

I wasn't sure if this was a special case, as the Oasis reference files seem to agree with Xalan.

Any help is appreciated!

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