Your problem is nothing to do with the switch, you would have the same
problem if you deleted the wrapper and had the osis element at the top
level.
<xsl:template match="osis">
that matches an element in no namespace with local name osis
<osis
xsi:schemaLocation="http://www.bibletechnologies.net/2003/OSIS/namespace
osisCore.2.0.xsd"
xmlns="http://www.bibletechnologies.net/2003/OSIS/namespace";
is an element in namespace
http://www.bibletechnologies.net/2003/OSIS/namespace with local name
osis so it does not match the template.
Add
xmlns:o="http://www.bibletechnologies.net/2003/OSIS/namespace";
to your xsl:stylesheet then use
<xsl:template match="o:osis">
David
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