The p:xslt step doesn't support passing parameters to the initial template

[ndw]

It has template-name, but no mechanism for passing parameters to that template. Two sets are required, one for tunneled parameters and one for parameters that aren't tunneled.

From Call-Template Invocation in the XSLT spec:

Parameters, which will be passed to the selected template rule. The parameters consist of two sets of (QName, value) pairs, one set for tunnel parameters and one for non-tunnel parameters, in which the QName identifies the name of a parameter and the value provides the value of the parameter. Either or both sets of parameters may be empty. The effect is the same as when a template is invoked using xsl:call-template with an xsl:with-param child specifying tunnel="yes" or tunnel="no" as appropriate. If a parameter is supplied that is not declared or used, the value is simply ignored. These parameters are not used to set stylesheet parameters.

I can't think of a nice way to deal with both sets of parameters in a single option. I can think of a couple of different contrived ways, but they're pretty ugly to use.

Add template-parameters and template-tunneled-parameters options? Presumably it's an error to specify either of those if template-name is not specified.

[xatapult]

I've always assumed that calling an initial template means calling it without explicitly setting parameters, but in retrospect, you're right.

Why can't we use the parameters option for the "normal" parameters in this case? That leaves us with something to add for the tunnel parameters: tunnel-parameters?

[xatapult]

And given the (I assume) rare use of this feature, IMHO we can move it to VNext.

[ndw]

I think we have to support three kinds of parameters:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="3.0">

<xsl:param name="global-param" select="0"/>

<xsl:template name="my-template">
  <xsl:param name="local-param"/>
  <xsl:param name="tunnel-param" tunnel="yes"/>

  <t>…</t>
</xsl:template>

</xsl:stylesheet>

If we can agree to a solution, I'd rather do it sooner than later. It's a clear error in the spec.

[xatapult]

Ok, we cab do that.

I would prefer to silently ignore any settings for these parameters if there is no initial template. It's not really an error...

[ndw]

I'm not going to lie down in the road over it, but I think we've generally taken the position that incoherent option combinations are an error. Setting template-parameters without template-name might be harmless, but it also might be that you intended that to be parameters and it's a cut-and-paste error we could help you catch.