> <Blog xmlns="http://tempuri.org/Blog.xsd">

The Blog element belongs to http://tempuri.org/Blog.xsd namespace.

> <?xml version="1.0" encoding="UTF-8" ?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> xmlns:myns="http://tempuri.org/Blog.xsd">
> <xsl:template match="myns:Blog">...

The template matches the Blog element from the http://tempuri.org/Blog.xsd
namespace.

> <Blog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://limpens.com/blog
> http://localhost/LimpensCom/webXML/Data/BlogSpy.xsd">

Here the Blog element is in no namespace so it will not be matched by your
template.