Enable textual diff of iWork Pages documents.

.gitattributes

*.pages/index.xml.gz	diff=iworkpages

config

[diff "iworkpages"]
	textconv = xsltproc $GIT_DIR/Pages.xsl

Pages.xsl

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:sf="http://developer.apple.com/namespaces/sf">

<xsl:template match="sf:p">
	<xsl:apply-templates/>
	<xsl:text>
</xsl:text>
</xsl:template>

<xsl:template match="sf:lnbr">
	<xsl:text>
</xsl:text>
</xsl:template>

<xsl:template>
	<xsl:value-of select="text()"/>
</xsl:template>

</xsl:stylesheet>

Hey! Actually, I went ahead and forked this gist to fix it to work with the newer .pages format. I had to add a shell script, because now the *.pages files are actually .zip files, so they have to be unzipped and then the unzipped files need to be deleted.

I wasn't able to add ".git/config" to my gist like you have, though, and my guess is because git has changed the rules since you posted this gist?

Anyway. If you want to pull from my updated gist, this should work for Pages '09 files:
https://gist.github.com/NHDaly/7669596