Moving a node from one Document to another

Question

Hi,
Could someone suggest a way to merge two XML Documents ?
Thanks in advance,
Sony
null

Answer 1

Here's an example of the XSL-based approach.
Assume your two XML source files are:
demo1.xml
<messages>
<msg>
<key>AAA</key>
<num>01001</num>
</msg>
<msg>
<key>BBB</key>
<num>01011</num>
</msg>
</messages>
demo2.xml
<messages>
<msg>
<key>AAA</key>
<text>This is a Message</text>
</msg>
<msg>
<key>BBB</key>
<text>This is another Message</text>
</msg>
</messages>
Here is a stylesheet the "joins" demo1.xml
to demo2.xml based on matching the "<key>" values...
demomerge.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:variable name="doc2" select="document('demo2.xml')"/>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="msg">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
<text><xsl:value-of select="$doc2/messages/msg[key=current()/key]/text"/></text>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
If you use the command-line "oraxsl" to test this out, you would do:
$ oraxsl demo1.xml demomerge.xsl
And you'll get the merged result of:
<messages>
<msg>
<key>AAA</key>
<num>01001</num>
<text>This is a Message</text>
</msg>
<msg>
<key>BBB</key>
<num>01011</num>
<text>This is another Message</text>
</msg>
</messages>
Obvious not as efficient for larger-sized files as an equivalent database "join" between two tables, but this illustrates the technique if you only have XML files to work with.