xslt copy deep xml if exists if not create - xslt-1.0

Question

<root>
<xnode>
<Node1/>
<Node2/>
<Node3>
<CNode1>
<CCNode1>
<CCField1>
<CCField2>
<CCCNode1/>
</CCNode1>
<CCNode2>
<CCCNode3/>
</Node3>
<Node4/>
</xnode>
<xnode>
<Node1/>
<Node2/>
<Node3>
<CNode1>
<CCNode2>
<CCCNode3/>
</Node3>
<Node4/>
</xnode>
<xnode>
<Node1/>
<Node2/>
<Node3>
<CNode1>
<CCNode1>
<CCField1>
<CCField2>
<CCCNode1/>
</CCNode1>
<CCNode2>
<CCCNode3/>
</Node3>
<Node4/>
</xnode>
</root>
In the above xml, I need to copy all the nodes and values except for Node3 - CNode1 - CCNode1. i.e. if CCNode1 exists copy as its including the child elements, if not, create CCNode1 with the corresponding fields and child elements. For ex, here the first and third xnode has CCNode1 whereas its missing in the second xnode. So copy the first and 3rd node1 as it is and create the CCNode1 and its child elements in the 2nd xnode with some dummy values.
Please suggest how to achieve this with XSLT.
THanks

Answer 1

So, the best I can tell is that you need an identity template to copy everything. And, then you need a template like the following to select Node3/CNode1 nodes that do not have a CCNode1 node. There you can add your nodes.
<xsl:template match="Node3/CNode1[not(.//CCNode1)]">
<xsl:copy>
Add your ccNode1 and child nodes here.
<!-- Output other child nodes of CNode1 -->
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<!-- Identity. -->
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>