Blog Aggregator: XML and XSLT

[Alpdog14]

I am very new to XML & XSL but I know there is a way to build blog aggregators. I have a XML document that pulls the blogs in with the URI:

<?xml version="1.0"?>

<!DOCTYPE feeds SYSTEM "feeds.dtd">
<feeds>

<feed name="Mary Rose's Blog"
provider="Blogabond"
spec="rss"
version="2.0"
uri="http://www.blogabond.com/rss/rss.aspx?UserID=7835">
<keyword name="meow"/>

</feed>
</feeds>

I also have a .xsl document that prints all the blog entries out properly:

<?xml version="1.0"?>

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:atom="http://www.w3.org/2005/Atom"
xmlns:openSearch="http://a9.com/-/spec/opensearchrss/1.0/"
xmlns:georss="http://www.georss.org/georss"
xmlns:aml="http://markup-languages.googlecode.com/ns/aml"
version="1.0">

<xsl:output method="xml" indent="yes" />

<xsl:template match="/feeds" >
<aml:aggregated>
<xsl:for-each select="feed">
<xsl:element name="aml:blog">
<xsl:copy-of select="@uri"/>
<xsl:apply-templates select="document(@uri)" mode="document"/>
<xsl:apply-templates select="keyword" mode="document" />
</xsl:element>
</xsl:for-each>
</aml:aggregated>
</xsl:template>

<xsl:template match="rss/channel" mode="document">
<xsl:for-each select="item">
<xsl:sort order="descending" select="atom:updated/text()"/>
<xsl:copy-of select="."/>

</xsl:for-each>
</xsl:template>

</xsl:stylesheet>

Now the problem I am having is sorting by the keyword I indicated in the XML document. As you can see I tried using the apply-templates but it still pulls in all the blog entries.

Another thing I want to do is add more feeds to my XML file but different feeds do not always use <pubDate> tag so how do I convert it to actually print the <pubDate>. Any help would be most appreciated.