Re: [xsl] Is there any benefit to creating a variable and specifying as="xs:string"?

["Roger L Costello costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Martin wrote:
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In schema-aware XSLT 2 or later I think you might be able to import a
schema that defines a type with some restrictions so that some of your
constraints are ensured and use that type in the "as" attribute.
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That sounds like an excellent approach Martin. So, I created an XSD with this
type definition:

    <xs:simpleType name="ICAOtype">
        <xs:restriction base="xs:string">
            <xs:length value="4"/>
            <xs:pattern value="[A-Z]+"/>
        </xs:restriction>
    </xs:simpleType>

In my XSLT program I imported the XSD:

<xsl:import-schema schema-location="ICAO.xsd"/>

For the param, I figured that I could add xsl:type, like this:

<xsl:param name="ICAO" xsl:type="ICAOtype"/>

But that results in this error message:

Attribute @xsl:type is not allowed on element <xsl:param>

Removing "xsl:" results in a similar error message:

<xsl:param name="ICAO" type="ICAOtype"/>

What is the right way to get a parameter validated against an XSD type?

/Roger