Given the following example xml file:
<?xml version="1.0"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
<book id="bk103">
<title>Maeve Ascendant</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-11-17</publish_date>
<description>After the collapse of a nanotechnology
society in England, the young survivors lay the
foundation for a new society.</description>
</book>
</catalog>
I need to merge all title elements into the author element, by a rule: If the author element already exists, then the title element's value will be inserted in the author record, using a separator ie a | character. If there is not an author element in the record, the title element would become the author element. Desired output:
<?xml version="1.0"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew | XML Developer's Guide</author>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim | Midnight Rain</author>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
<book id="bk103">
<author>Maeve Ascendant</author>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-11-17</publish_date>
<description>After the collapse of a nanotechnology
society in England, the young survivors lay the
foundation for a new society.</description>
</book>
</catalog>
How the above result could be achieved using xslt-3?
What I would do is strip the existing author element and replace the title element with a new author element.
The value of the new author element would be a string-join of the original author (if it exists) and the current title value separated by |.
Example...
<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:mode on-no-match="shallow-copy"/>
<xsl:template match="author"/>
<xsl:template match="title">
<author>
<xsl:value-of select="string-join((../author,.),' | ')"/>
</author>
</xsl:template>
</xsl:stylesheet>
Note: This would work as XSLT 2.0 too if you replaced xsl:mode with the identity transform.
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