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REx_css-parser.xsl
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REx_css-parser.xsl
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xslout="bogo"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:tr="http://transpect.io"
xmlns:html="http://www.w3.org/1999/xhtml"
xmlns:css="http://www.w3.org/1996/css"
version="2.0"
exclude-result-prefixes="xs"
xmlns="http://www.w3.org/1996/css">
<xsl:import href="css-util.xsl"/>
<xsl:import href="CSS3.xsl"/>
<xsl:output indent="yes" />
<xsl:param name="base-uri" select="base-uri(/*)" as="xs:string" />
<xsl:template match="/">
<css xmlns="http://www.w3.org/1996/css">
<xsl:choose>
<xsl:when test="matches(base-uri(/*), '^file:/')">
<xsl:attribute name="xml:base" select="base-uri(/*)"/>
</xsl:when>
<xsl:otherwise>
<xsl:message select="'Spurious base URI: ', base-uri(/*)"/>
</xsl:otherwise>
</xsl:choose>
<!-- <css xmlns="http://www.w3.org/1996/css" xml:base="{base-uri(/*)}">-->
<xsl:variable name="extracted-css">
<xsl:apply-templates select="html:html/html:head/(html:link[@rel eq 'stylesheet'] union html:style)" mode="extract-css" />
</xsl:variable>
<xsl:sequence select="$extracted-css"/>
</css>
</xsl:template>
<xsl:function name="tr:external-css-file-available" as="xs:boolean">
<xsl:param name="href-attr-or-css-url-value" as="xs:string"/>
<xsl:param name="baseuri" as="xs:string"/>
<xsl:variable name="resolved" as="xs:anyURI"
select="resolve-uri($href-attr-or-css-url-value, $baseuri)"/>
<xsl:choose>
<xsl:when test="unparsed-text-available($resolved, 'UTF-8')">
<xsl:sequence select="true()"/>
</xsl:when>
<xsl:when test="unparsed-text-available($resolved, 'CP1252')">
<xsl:sequence select="true()"/>
</xsl:when>
<xsl:otherwise>
<xsl:sequence select="false()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
<xsl:function name="tr:resolve-css-file-content" as="xs:string?">
<xsl:param name="href-attr-or-css-url-value" as="xs:string"/>
<xsl:param name="baseuri" as="xs:string"/>
<xsl:variable name="resolved" as="xs:anyURI"
select="resolve-uri($href-attr-or-css-url-value, $baseuri)"/>
<xsl:choose>
<xsl:when test="unparsed-text-available($resolved, 'UTF-8')">
<xsl:sequence select="unparsed-text($resolved, 'UTF-8')"/>
</xsl:when>
<xsl:otherwise>
<xsl:choose>
<xsl:when test="unparsed-text-available($resolved, 'CP1252')">
<xsl:sequence select="unparsed-text($resolved, 'CP1252')"/>
</xsl:when>
<xsl:otherwise>
<xsl:message>External stylesheet '<xsl:value-of select="$href-attr-or-css-url-value"/>'
(resolved as <xsl:value-of select="$resolved"/>) not found
or wrong encoding. Supported encodings: UTF-8, CP1252 (the latter should work for ISO-8859-1, too)</xsl:message>
</xsl:otherwise>
</xsl:choose>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
<xsl:template match="html:link[@type eq 'text/css']" mode="extract-css" as="element(*)*">
<xsl:variable name="external-css" as="xs:string?"
select="tr:resolve-css-file-content(@href, $base-uri)"/>
<xsl:variable name="extracted-css">
<xsl:sequence select="if($external-css)
then tr:extract-css($external-css, resolve-uri(@href, $base-uri))
else ()"/>
</xsl:variable>
<xsl:variable name="post-processed-css">
<xsl:apply-templates select="$extracted-css" mode="post-process">
<xsl:with-param name="origin" select="resolve-uri(@href, $base-uri)" tunnel="yes"/>
</xsl:apply-templates>
</xsl:variable>
<xsl:apply-templates select="$post-processed-css" mode="add-position"/>
</xsl:template>
<xsl:template match="html:style" mode="extract-css">
<xsl:sequence select="tr:extract-css(string-join(for $n in node() return $n, ''), 'file://internal')" />
</xsl:template>
<xsl:function name="tr:extract-css" as="element(*)*">
<xsl:param name="raw-css" as="xs:string?"/>
<xsl:param name="origin" as="xs:string"/>
<xsl:call-template name="main">
<xsl:with-param name="input" select="if (matches($origin,'internal'))
then (concat('{', normalize-space(replace($raw-css,'
','')),'}'))
else $origin"/>
</xsl:call-template>
</xsl:function>
<xsl:variable name="css:pseudo-classes-regex" select="':(first-child|last-child|link|visited|hover|active|focus|lang|first-line|first-letter|before|after)'" as="xs:string"/>
<xsl:function name="tr:resolve-attributes" as="xs:string">
<xsl:param name="var-resolve-attributes" />
<xsl:variable name="quots">"</xsl:variable>
<xsl:variable name="attribute" select="$var-resolve-attributes/*:IDENT[1][preceding-sibling::*[1][self::*:TOKEN[matches(.,'\[')]]]"/>
<xsl:variable name="value" select="replace($var-resolve-attributes/*[following-sibling::*[1][self::TOKEN[matches(.,'\]')]]],$quots,'')"/>
<xsl:variable name="token" select="$var-resolve-attributes/descendant::*:TOKEN[not(matches(.,'\[|\]'))]"/>
<xsl:variable name="atts_declaration">
<xsl:choose>
<xsl:when test="not ($token) or $token = ''">
<xsl:text>exists(@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>)</xsl:text>
</xsl:when>
<xsl:when test="$token = '='">
<xsl:text>@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>='</xsl:text>
<xsl:value-of select="$value"/>
<xsl:text>'</xsl:text>
</xsl:when>
<xsl:when test="$token = '~='">
<xsl:text>matches(@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>,'(^|\s)</xsl:text>
<xsl:value-of select="$value"/>
<xsl:text>(\s|$)')</xsl:text>
</xsl:when>
<xsl:when test="$token = '|='">
<xsl:text>matches(@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>,'^</xsl:text>
<xsl:value-of select="$value"/>
<xsl:text>-?$')</xsl:text>
</xsl:when>
<xsl:when test="$token = '^='">
<xsl:text>matches(@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>,'^</xsl:text>
<xsl:value-of select="$value"/>
<xsl:text>')</xsl:text>
</xsl:when>
<xsl:when test="$token = '$='">
<xsl:text>matches(@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>,'</xsl:text>
<xsl:value-of select="$value"/>
<xsl:text>$')</xsl:text>
</xsl:when>
<xsl:when test="$token = '*='">
<xsl:text>matches(@</xsl:text>
<xsl:value-of select="$attribute"/>
<xsl:text>,'</xsl:text>
<xsl:value-of select="$value"/>
<xsl:text>')</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="."/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:sequence select="string-join($atts_declaration, '')"/>
</xsl:function>
<xsl:function name="tr:getPriority">
<xsl:param name="selector" />
<!--a, @style-->
<xsl:value-of select="'0'" />
<xsl:text>,</xsl:text>
<!--b, count id attributes-->
<xsl:value-of select="count($selector/descendant::*:HASH)" />
<xsl:text>,</xsl:text>
<!--c, count attributes and pseudo-classes-->
<xsl:value-of select="count($selector/descendant::*:attrib)
+ count($selector/descendant::*:pseudo[matches(.,'first-child|last-child|link|visited|hover|active|focus|lang')])" />
<xsl:text>,</xsl:text>
<!--d, count elements and pseudo-elements-->
<xsl:value-of select="count($selector/descendant::*:combinator) + count($selector/descendant::*:pseudo[matches(.,'first-line|first-letter|before|after')])" />
</xsl:function>
<!-- mode post-process -->
<xsl:template match="*:S | *:atrule | *:COMMENT
|*:TOKEN[matches(.,'[\{\[}\]\};]')]
| *:simple_atrule[not(matches(string-join(*:TOKEN,'') , 'import'))]
| *:mediaquery" mode="post-process"/>
<xsl:template match="*:css" mode="post-process">
<xsl:apply-templates mode="#current"/>
</xsl:template>
<xsl:template match="*:rule" mode="post-process">
<xsl:param name="origin" tunnel="yes"/>
<xsl:element name="{if (descendant::*:atrule) then 'atrule' else 'ruleset'}" namespace="http://www.w3.org/1996/css">
<xsl:attribute name="origin" select="$origin "/>
<xsl:if test="descendant::*:atrule">
<xsl:attribute name="type" select="descendant::*:atrule/*:IDENT"/>
</xsl:if>
<xsl:apply-templates mode="#current"/>
</xsl:element>
</xsl:template>
<xsl:template match="*:declaration" mode="post-process">
<xsl:variable name="value" select="*:values"/>
<xsl:variable name="property" select="*:property/*/text()"/>
<xsl:for-each select="$value">
<xsl:choose>
<xsl:when test="$property = $css-shorthand-properties">
<xsl:sequence select="tr:handle-shorthand-properties($property, current(), string(position()))" />
</xsl:when>
<xsl:otherwise>
<xsl:element name="declaration">
<xsl:attribute name="property" select="$property"/>
<xsl:attribute name="value" select="current()"/>
<xsl:variable name="css-url-regex" select="'.*?url\(''?(.+?)''?\).*'" as="xs:string"/>
<xsl:if test="matches(current(), $css-url-regex) or current()/descendant::*:URL">
<xsl:element name="resource">
<xsl:attribute name="src" select="resolve-uri(replace(current(),$css-url-regex,'$1'), $base-uri)"/>
</xsl:element>
</xsl:if>
</xsl:element>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
<xsl:template match="*:selectors_group" mode="post-process">
<xsl:element name="selector">
<xsl:attribute name="priority" select="tr:getPriority(*:selector)" />
<xsl:attribute name="raw-selector" select="string-join(descendant::text(),'')"/>
<xsl:if test="descendant::*:pseudo">
<xsl:attribute name="pseudo" select="descendant::*:pseudo/*:IDENT"/>
</xsl:if>
<xsl:apply-templates mode="#current"/>
</xsl:element>
</xsl:template>
<xsl:template match="*:element_name" mode="post-process">
<xsl:param name="condition" tunnel="yes"/>
<xsl:sequence select="concat('*:', .)"/>
<xsl:if test="$condition">
<xsl:text>]</xsl:text>
</xsl:if>
</xsl:template>
<xsl:template match="*:pseudo" mode="post-process">
<xsl:text>[@css:pseudo_</xsl:text>
<xsl:value-of select="*:IDENT"/>
<xsl:text>]</xsl:text>
</xsl:template>
<xsl:template match="*:simple_selector_sequence/*:HASH" mode="post-process">
<xsl:sequence select="if (preceding::*[1]/descendant-or-self::*:IDENT)
then '['
else '*['"/>
<xsl:text>@id='</xsl:text>
<xsl:value-of select="replace(.,'#','')"/>
<xsl:text>']</xsl:text>
</xsl:template>
<xsl:template match="*:simple_selector_sequence/*:class" mode="post-process">
<xsl:sequence select="if (preceding::*[1]/descendant-or-self::*:IDENT)
then '['
else '*['"/>
<xsl:text>matches(@class</xsl:text>
<xsl:text>,'(^|\s)</xsl:text>
<xsl:value-of select="*:IDENT"/>
<xsl:text>(\s|$)')</xsl:text>
<xsl:text>]</xsl:text>
</xsl:template>
<xsl:template match="*:simple_selector_sequence/*:universal" mode="post-process">
<xsl:text>*</xsl:text>
</xsl:template>
<xsl:template match="*:selector/*:combinator" mode="post-process">
<xsl:choose>
<xsl:when test="matches(.,'>')">
<xsl:text>/</xsl:text>
</xsl:when>
<xsl:when test="matches(.,' ')">
<xsl:text>[ancestor::</xsl:text>
</xsl:when>
<xsl:when test="matches(.,'\+')">
<xsl:text>/preceding::*[1]/self::</xsl:text>
</xsl:when>
<xsl:when test="matches(.,'~')">
<xsl:text>[preceding-sibling::</xsl:text>
</xsl:when>
<xsl:when test="matches(.,'\,')">
<xsl:text>|</xsl:text>
</xsl:when>
</xsl:choose>
</xsl:template>
<xsl:template match="*:attrib" mode="post-process">
<xsl:sequence select="if (preceding::*[1]/descendant-or-self::*:IDENT)
then '['
else '*['"/><xsl:sequence select="tr:resolve-attributes(.)"/>
<xsl:text>]</xsl:text>
</xsl:template>
<xsl:template match="*:simple_selector_sequence|*:type_selector" mode="post-process">
<xsl:apply-templates mode="#current"/>
</xsl:template>
<!-- reorder simple_selector_sequence according to it's xpath (e.g. combinator ' ' in ancestor::)-->
<xsl:template match="*:selector[*:combinator[matches(descendant::text(),' |~')]]" mode="post-process">
<xsl:param name="condition" tunnel="yes"/>
<xsl:apply-templates select="*:simple_selector_sequence[preceding-sibling::*:combinator]" mode="#current">
</xsl:apply-templates>
<xsl:apply-templates select="*:combinator" mode="#current"/>
<xsl:apply-templates select="*:simple_selector_sequence[following-sibling::*:combinator]" mode="#current">
<xsl:with-param name="condition" select="true()" tunnel="yes"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="*:COMMA" mode="post-process">
<xsl:text>|</xsl:text>
</xsl:template>
<xsl:template match="*:selector" mode="post-process">
<xsl:apply-templates mode="#current"/>
</xsl:template>
<xsl:template match="*:simple_atrule[matches(string-join(*:TOKEN,'') , 'import')]" mode="post-process">
<xsl:param name="origin" tunnel="yes"/>
<xsl:variable name="imported-css" select="tr:resolve-css-file-content(replace(string-join(*:STRING,''),'''',''), $origin)"/>
<xsl:variable name="extracted-imported-css" select="tr:extract-css($imported-css, resolve-uri(replace(string-join(*:STRING,''),'''',''), $origin))"/>
<xsl:variable name="post-processed-css">
<xsl:apply-templates select="$extracted-imported-css" mode="post-process">
<xsl:with-param name="origin" select="resolve-uri(replace(string-join(*:STRING,''),'''',''), $origin)" tunnel="yes"/>
</xsl:apply-templates>
</xsl:variable>
<xsl:apply-templates select="$post-processed-css" mode="add-position"/>
</xsl:template>
<!-- mode add-position -->
<xsl:template match="node()" mode="add-position post-process">
<xsl:copy >
<xsl:apply-templates select="@*|node()" mode="#current" />
</xsl:copy>
</xsl:template>
<xsl:template match="@*" mode="add-position">
<xsl:copy-of select="." />
</xsl:template>
<xsl:template match="*:selector" mode="add-position">
<xsl:copy>
<xsl:apply-templates select="@*" mode="#current" />
<xsl:attribute name="position" select="count(parent::*:ruleset/preceding-sibling::*:ruleset)+1" />
<xsl:apply-templates select="node()" mode="#current" />
</xsl:copy>
</xsl:template>
<!-- overwritten function from css-util -->
<xsl:function name="tr:handle-shorthand-properties" as="element(*)*">
<xsl:param name="prop" as="xs:string"/>
<xsl:param name="val"/>
<xsl:param name="id" as="xs:string"/>
<xsl:variable name="val-seq" select="$val"/>
<xsl:variable name="out" as="element(*)*">
<xsl:choose>
<xsl:when test="$prop=('margin', 'padding', 'border-style', 'border-color', 'border-width')">
<xsl:variable name="new-props">
<props count="1">
<top seq="1"/>
<right seq="1"/>
<bottom seq="1"/>
<left seq="1"/>
</props>
<props count="2">
<top seq="1"/>
<right seq="2"/>
<bottom seq="1"/>
<left seq="2"/>
</props>
<props count="3">
<top seq="1"/>
<right seq="2"/>
<bottom seq="3"/>
<left seq="2"/>
</props>
<props count="4">
<top seq="1"/>
<right seq="2"/>
<bottom seq="3"/>
<left seq="4"/>
</props>
</xsl:variable>
<xsl:choose>
<xsl:when test="count($val-seq) le 4">
<xsl:for-each select="$new-props/*:props[number(@count) eq count($val-seq/*:value)]/*">
<xsl:element name="declaration" xmlns="http://www.w3.org/1996/css">
<xsl:attribute name="property"
select="concat(replace($prop, '-.*$', ''), '-', name(), substring-after($prop, 'border'))"/>
<xsl:attribute name="value" select="$val-seq/*:value[position() eq number(current()/@seq)]"/>
<xsl:attribute name="shorthand" select="$id"/>
</xsl:element>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<xsl:message>ERROR! There is something wrong with property count in shorthand property "<xsl:value-of
select="$prop"/>": <xsl:value-of select="$val"/></xsl:message>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:when test="$prop=('border')">
<xsl:call-template name="border-vals">
<xsl:with-param name="all-pos" select="'top right bottom left'"/>
<xsl:with-param name="val" select="$val-seq"/>
<xsl:with-param name="id" select="$id"/>
</xsl:call-template>
</xsl:when>
<xsl:when test="matches($prop, '^border-(left|right|top|bottom)$')">
<xsl:call-template name="border-vals">
<xsl:with-param name="all-pos" select="substring-after($prop, 'border-')"/>
<xsl:with-param name="val" select="$val-seq"/>
<xsl:with-param name="id" select="$id"/>
</xsl:call-template>
</xsl:when>
<xsl:when test="$prop='background'">
<xsl:variable name="new-vals">
<vals>
<image pos-vals="(none|url)"/>
<attachment pos-vals="(scroll|fixed)"/>
<repeat pos-vals="^(no-repeat|repeat|repeat-x|repeat-y)"/>
<color pos-vals="(transparent|\(|[a-z]+|#[0-9a-fA-F]+)"/>
<position pos-vals="(left|right|top|bottom|center|[.0-9]+(%|em|ex|px|in|cm|mm|pt|pc))"/>
</vals>
</xsl:variable>
<xsl:for-each select="tokenize(replace($val-seq, ',\s', ','), ' ')">
<xsl:variable name="current-val">
<xsl:choose>
<xsl:when test="matches(., $new-vals//*:image/@pos-vals)">image</xsl:when>
<xsl:when test="matches(., $new-vals//*:attachment/@pos-vals)">attachment</xsl:when>
<xsl:when test="matches(., $new-vals//*:repeat/@pos-vals)">repeat</xsl:when>
<xsl:when test="matches(., $new-vals//*:position/@pos-vals)">position</xsl:when>
<xsl:when test="matches(., $new-vals//*:color/@pos-vals)">color</xsl:when>
<xsl:otherwise/>
</xsl:choose>
</xsl:variable>
<xsl:element name="declaration" xmlns="http://www.w3.org/1996/css">
<xsl:attribute name="property" select="concat('background-', $current-val)"/>
<xsl:attribute name="value" select="."/>
<xsl:attribute name="shorthand" select="$id"/>
</xsl:element>
</xsl:for-each>
</xsl:when>
<xsl:when test="$prop='font'">
<xsl:variable name="tokens" select="$val-seq/*:value"/>
<xsl:choose>
<xsl:when test="count($tokens) = 2">
<!-- token 1 is size, token 2 is family -->
<declaration xmlns="http://www.w3.org/1996/css" property="font-size" value="{$tokens[1]}" shorthand="{$id}"/>
<declaration xmlns="http://www.w3.org/1996/css" property="font-family" value="{$tokens[2]}" shorthand="{$id}"/>
</xsl:when>
<xsl:otherwise>
<xsl:for-each select="('style', 'weight', 'size' , 'line-height', 'family')">
<xsl:variable name="current-pos" select="position()"/>
<xsl:element name="declaration" xmlns="http://www.w3.org/1996/css">
<xsl:attribute name="property" select="if (current() = 'line-height') then current() else concat('font-', .)"/>
<xsl:choose>
<xsl:when test="$val/*:value = 'inherit'">
<xsl:attribute name="value" select="$val"/>
</xsl:when>
<xsl:otherwise>
<xsl:attribute name="value"
select="$tokens[if ($current-pos le 4) then (position() eq $current-pos) else (position() ge 5)]"/>
</xsl:otherwise>
</xsl:choose>
<xsl:attribute name="shorthand" select="$id"/>
</xsl:element>
</xsl:for-each>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:when test="$prop='list-style'">
<xsl:variable name="new-vals">
<vals>
<type
pos-vals="(circle|square|disc|decimal|lower-roman|upper-roman|decimal-leading-zero|lower-greek|lower-latin|upper-latin|armenian|georgian|none)"/>
<position pos-vals="(inside|outside)"/>
<image pos-vals="(none|url)"/>
</vals>
</xsl:variable>
<xsl:for-each select="tokenize($val, ' ')">
<xsl:variable name="current-pos" select="position()"/>
<xsl:variable name="current-val">
<xsl:choose>
<xsl:when test="matches(., $new-vals//*:position/@pos-vals)">position</xsl:when>
<xsl:when
test="matches(., $new-vals//*:type/@pos-vals) and (not(. eq 'none' and (exists(tokenize($val, ' ')[position() ne $current-pos][matches(., $new-vals//*:type/@pos-vals)]))) or (. eq 'none' and (exists(tokenize($val, ' ')[position() gt $current-pos][. eq 'none']))))"
>type</xsl:when>
<xsl:when test="matches(., $new-vals//*:image/@pos-vals)">image</xsl:when>
<xsl:otherwise/>
</xsl:choose>
</xsl:variable>
<xsl:element name="declaration" xmlns="http://www.w3.org/1996/css">
<xsl:attribute name="property" select="concat('list-style-', $current-val)"/>
<xsl:attribute name="value" select="."/>
<xsl:attribute name="shorthand" select="$id"/>
</xsl:element>
</xsl:for-each>
</xsl:when>
<xsl:when test="$prop='text-decoration'">
<xsl:variable name="new-vals">
<vals>
<style pos-vals="(solid|double|dotted|dashed|wavy)"/>
<line pos-vals="(none|underline|overline|line-through|blink)"/>
<color pos-vals="(transparent|\(|[a-z]+|#[0-9a-fA-F]+)"/>
</vals>
</xsl:variable>
<xsl:for-each select="tokenize(replace($val, ',\s', ','), ' ')">
<xsl:variable name="current-val">
<xsl:choose>
<xsl:when test="matches(., $new-vals//*:style/@pos-vals)">style</xsl:when>
<xsl:when test="matches(., $new-vals//*:line/@pos-vals)">line</xsl:when>
<xsl:when test="matches(., $new-vals//*:color/@pos-vals)">color</xsl:when>
<xsl:otherwise/>
</xsl:choose>
</xsl:variable>
<xsl:if test="$current-val">
<!--<css:declaration/>-->
<xsl:element name="declaration" xmlns="http://www.w3.org/1996/css">
<xsl:attribute name="property" select="concat('text-decoration-', $current-val)"/>
<xsl:attribute name="value" select="."/>
<xsl:attribute name="shorthand" select="$id"/>
</xsl:element>
</xsl:if>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<xsl:message>WARNING! Shorthand property "<xsl:value-of select="$prop"/>" has not been implemented, yet!</xsl:message>
<xsl:element name="declaration" xmlns="http://www.w3.org/1996/css">
<xsl:attribute name="property" select="$prop"/>
<xsl:attribute name="value" select="$val"/>
<xsl:attribute name="shorthand" select="$id"/>
</xsl:element>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:if test="empty($out)">
<xsl:message select="'Empty compound prop expansion for prop ', $prop, ' with value ', $val"/>
</xsl:if>
<xsl:sequence select="$out"/>
</xsl:function>
</xsl:stylesheet>