xform.rb

require 'date'
require 'nokogiri'

inFile, outFile, ark = ARGV
io = File.open(inFile, "r"); input = Nokogiri::XML(io); io.close
# Evil? Sure, but makes for less code and this doc doesn't need them.
input.remove_namespaces! 
feed = input.root

out = Nokogiri::XML::Builder.new { |xml|
    # Create the main UCI record element, with its many attributes
    xml.record(id:         ark,
               dateStamp:  DateTime.now.iso8601,
               # Sadly we can't use matches() below because Nokogiri only supports XPath 1.0
               pubType:    feed.xpath("category[contains(@term, '/journal-article')]") ? 'article' :
                           feed.xpath("category[contains(@term, '/book')]") ? 'monograph' : 
                           feed.xpath("category[contains(@term, '/chapter')]") ? 'chapter' : 
                           raise('unknown pubType'),
               peerReview: 'yes',
               pubStatus:  'externalPub',
               state:      'published',
               stateDate:  feed.at('updated').text
    ) {
        # Translate author metadata
        feed.xpath("//field[@name='authors']/people").each { |people|
            xml.authors {
                people.xpath("person").each { |person|
                    xml.author {
                        if person.at("first-name") then xml.fname(person.at("first-name").text)
                        elsif person.at("initials") then xml.fname(person.at("initials").text); end
                        if person.at("last-name") then xml.lname(person.at("last-name").text); end
                        if person.at("suffix") then xml.lname(person.at("suffix").text); end
                        if person.at("email") then xml.lname(person.at("email").text); end
                    }
                }
            }
        }

        # Children normally inherit their parent's namespace; do it last to only affect parent.
        xml.parent.namespace = xml.parent.add_namespace("uci", "http://www.cdlib.org/ucingest")
    }
}

File.open(outFile, "w") { |io| out.doc.write_xml_to(io) }

xform1.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"
    xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:pubs="http://www.symplectic.co.uk/publications/atom-api"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xsl atom pubs xs">
    
    <xsl:output method="xml" indent="yes" encoding="UTF-8"/>

    <xsl:param name="ark"/>

    <!-- Root Template -->
    <xsl:template match="/atom:feed">
        
        <!-- Create the main UCI record element, with its many attributes -->
        <uci:record xmlns:uci="http://www.cdlib.org/ucingest" 
            id="{$ark}" 
            dateStamp="{current-dateTime()}" 
            peerReview="yes" 
            pubStatus="internalPub" state="published" 
            stateDate="{atom:updated/text()}">

            <!-- Publication type -->
            <xsl:choose>
                <xsl:when test="atom:category[matches(@term, '.*/journal-article$')]">
                    <xsl:attribute name="type" select="'paper'"/>
                </xsl:when>
                <xsl:when test="atom:category[matches(@term, '.*/book$')]">
                    <xsl:attribute name="type" select="'monograph'"/>
                </xsl:when>
                <xsl:when test="atom:category[matches(@term, '.*/chapter$')]">
                    <xsl:attribute name="type" select="'chapter'"/>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:message terminate="yes">Unrecognized pubtype</xsl:message>
                </xsl:otherwise>
            </xsl:choose>

            <!-- Everything else -->
            <xsl:apply-templates/>
        </uci:record>

    </xsl:template>

    <!-- Disable XSLT default of copying all text -->
    <xsl:template match="text()"/>

    <!-- Translate author metadata -->
    <xsl:template match="pubs:field[@name='authors']">
        <authors>
            <xsl:for-each select="pubs:people/pubs:person">
                <author>
                    <xsl:choose>
                        <xsl:when test="pubs:first-name">
                            <fname><xsl:value-of select="pubs:first-name"/></fname>
                        </xsl:when>
                        <xsl:when test="pubs:initials">
                            <fname><xsl:value-of select="pubs:initials"/></fname>
                        </xsl:when>
                    </xsl:choose>
                    <xsl:if test="pubs:last-name">
                        <lname><xsl:value-of select="pubs:last-name"/></lname>
                    </xsl:if>
                    <xsl:if test="pubs:suffix">
                        <suffix><xsl:value-of select="pubs:suffix"/></suffix>
                    </xsl:if>
                    <xsl:if test="pubs:email">
                        <email><xsl:value-of select="pubs:email"/></email>
                    </xsl:if>
                </author>
            </xsl:for-each>
        </authors>
    </xsl:template>

</xsl:stylesheet>

xform2.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"
    xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:pubs="http://www.symplectic.co.uk/publications/atom-api"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xsl atom pubs xs">
    
    <xsl:output method="xml" indent="yes" encoding="UTF-8"/>

    <xsl:param name="ark"/>

    <!-- Root Template -->
    <xsl:template match="/atom:feed">
        
        <!-- Create the main UCI record element, with its many attributes -->
        <uci:record xmlns:uci="http://www.cdlib.org/ucingest" 
            id="{$ark}" 
            dateStamp="{current-dateTime()}" 
            peerReview="yes" 
            pubStatus="internalPub" state="published" 
            stateDate="{atom:updated/text()}">

            <!-- Publication type -->
            <xsl:variable name="type" select="if (ends-with(atom:category/@term, '/journal-article'))
                                                then 'paper' else
                                              if (ends-with(atom:category/@term, '/book'))
                                                then 'monograph' else
                                              if (ends-with(atom:category/@term, '/chapter'))
                                                then 'chapter' else ''
            "/>
            <xsl:if test="$type=''">
                <xsl:message terminate="yes">Unrecognized pubtype</xsl:message>
            </xsl:if>
            <xsl:attribute name="type" select="$type"/>
            <!-- Everything else -->
            <xsl:apply-templates/>
        </uci:record>

    </xsl:template>

    <!-- Disable XSLT default of copying all text -->
    <xsl:template match="text()"/>

    <!-- Translate author metadata -->
    <xsl:template match="pubs:field[@name='authors']">
        <authors>
            <xsl:apply-templates select="pubs:people/pubs:person">
        </authors>
    </xsl:template>
    
    <xsl:template match="pubs:person">
        <author>
            <xsl:choose>
                <xsl:when test="pubs:first-name">
                    <xsl:apply-templates select="pubs:first-name"/>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:apply-templates select="pubs:initials"/>
                </xsl:otherwise>
            <xsl:apply-templates select="pubs:last-name,pubs:suffix,pubs:email"/>
        </author>
    </xsl:template>
    
    <xsl:template match="pubs:first-name|pubs:initials|pubs:last-name|pubs:suffix|pubs:email">
        <xsl:variable name="name" select="if (local-name()='first-name' or local-name(initials)='') then 'fname' else
                                          if (local-name()='last-name') then 'lname' else local-name()
        "/>
        <xsl:element name="$name">
            <xsl:value-of select="."/>
        </xsl:element>
    </xsl:template>
    
</xsl:stylesheet>