sort KML for @michaelhoffman https://twitter.com/michaelhoffman/status/681959184573661185 sort each Placemark inside each Folder on key=styleUrl

README.md

##Usage:

xsltproc transform.xsl doc.kml

Test

$ xsltproc transform.xsl doc.kml |grep -E '(Folder|styleUrl)' | head
		<Folder><name>Good Food</name><Placemark>
				<styleUrl>#icon-503-DB4436</styleUrl>
				<styleUrl>#icon-503-DB4436-nodesc</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>
				<styleUrl>#icon-959-3F5BA9</styleUrl>

transform.xsl

<?xml version="1.0"?>
<xsl:stylesheet
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:k="http://www.opengis.net/kml/2.2"
	xmlns="http://www.opengis.net/kml/2.2"
	exclude-result-prefixes="k"
	version="1.0">
<xsl:output method="xml" encoding="UTF-8" indent="yes"/>

<xsl:template match="/">
<xsl:apply-templates select="*"/>
</xsl:template>


<xsl:template match="@*|node()">
    <xsl:copy>
        <xsl:apply-templates select="@*|node()" />
    </xsl:copy>
</xsl:template>

<xsl:template match="k:Folder">
<Folder>
<xsl:copy-of select="k:name"/>
<xsl:for-each select="k:Placemark">
 <xsl:sort select="k:styleUrl/text()" />
 <xsl:copy-of select="."/>
</xsl:for-each>
</Folder>
</xsl:template>

</xsl:stylesheet>