extending XSLT using C# classes

Here's an example with two class static functions that can be called from within the xslt. There is also one variable that is set using a call to the Mixed() function.
Gary Davis
 

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" 
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl"
	xmlns:AECScript="urn:my-scripts">
	<msxsl:script language="C#" implements-prefix="AECScript">
		<msxsl:assembly name="System.Web" />
		<msxsl:assembly name="AEC.2" />
		<msxsl:using namespace="AEC" />
		<![CDATA[
			public string Mixed(string s) {
				StrMixed strMixed = new StrMixed();
				return (strMixed.Mixed(s));
			}
			
			public string UPCCheckChar(string s) {
				return (AECLib.UPCCheckChar(s));
			}
		]]>
	</msxsl:script>
 
	<xsl:output method="html" encoding="utf-8" indent = "yes" />
	<xsl:variable name="ItemTitle" select="AECScript:Mixed(//Item/title)" />
    :
    :
    :
 
 
This is the classlibrary:
 
namespace AEC
{
    public class StrMixed
        {
            public StrMixed()
            {
                :
                :
                :
            }
        }
    }
}

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so are these classes with in C# , That you have created or are they built in function of C#.

if i wanted to do something like this, would i just need to create a class that performs the action i want and then call it from the XSL

I have just been reading something about having to include the instruction in the XsltArgumentList, but i am struggling to get my head around it.