[xml] multiple xsl:output declarations don't allow unsetting doctype-*

I wasn't able to find anything about this issue in the archives or bug tracking:

I have an XSL stylesheet with two xsl:output elements, and I wish I could have the second xsl:output "override" the declaration of doctype on the first one. See below [1] for a simplified snippet of my XSL code (and libxslt version number).

The XSL spec is a little unclear (to me) on the behavior in this case [2], suggesting "the effective value is the specified value with the highest import precedence". Since the doctype-public on the first xsl:output element is the only specified value, the behavior of xsltproc seems to follow the spec. However it leaves me with no way of overriding an imported xsl:output method's doctype declaration elsewhere in the stylesheet...

I will probably code up a patch to xsltproc to have empty string do the override (i.e. doctype-public=""), since we need this to work in our software.

Does anyone have a better idea, or other interpretation or advice? Or is anyone interested in my patch?

Thanks for any help you can offer!


[1] My simplified stylesheet:

<?xml version="1.0" ?>
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0"

<xsl:output method="html"
  doctype-public="-//W3C//DTD HTML 4.01 Transitional//EN"

<xsl:output method="xml" />

<xsl:template match="/">
  <foo />

generates the following output:

[pawlowski dev3 libxslt-1.1.24]$ ./xsltproc/xsltproc t t
<?xml version="1.0"?>
<!DOCTYPE foo PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";>

[pawlowski dev3 libxslt-1.1.24]$ ./xsltproc/xsltproc --version
Using libxml 20702, libxslt 10124 and libexslt 813
xsltproc was compiled against libxml 20702, libxslt 10124 and libexslt 813
libxslt 10124 was compiled against libxml 20702
libexslt 813 was compiled against libxml 20702

[2] http://www.w3.org/TR/xslt#output

"A stylesheet may contain multiple xsl:output elements and may include or import stylesheets that also contain xsl:output elements. All the xsl:output elements occurring in a stylesheet are merged into a single effective xsl:output element. For the cdata-section-elements attribute, the effective value is the union of the specified values. For other attributes, the effective value is the specified value with the highest import precedence. It is an error if there is more than one such value for an attribute. An XSLT processor may signal the error; if it does not signal the error, if should recover by using the value that occurs last in the stylesheet. The values of attributes are defaulted after the xsl:output elements have been merged; different output methods may have different default values for an attribute."

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