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regarding the extension library



hello i have a question regarding using the extension library 
function ussage.
i have seen articles that use the toUpperCase of String method in 
the following way.
for xml

<colors>
  <color>red</color>
  <color>blue</color>
  <color>green and pink</color>
</colors>


using the java's to upper case, the xsl would be

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xalan = "http://xml.apache.org/xalan"; 
exclude-result-prefixes="xalan" xmlns:java = "java">
<xsl:template match="/">
<xsl:for-each select="/colors/color">
<xsl:variable name="color" select="java:lang.String.new(.)"/>
 from java: <xsl:value-of select="java:toUpperCase($color)"/>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

where we instantiate the String object by saying 
java:lang.String.new()  and then call the toUpperCase Method on 
that string. thaz fine.

I have then formed my own utility class that returns the string in 
the uppercase( just for test purpose ). This Class is StrUtils 
which has a method called upperCase()that takes the String to be 
converted to the uppercase and returns String in uppercase.
( I am doing this purely for test purpose)
and i am calling this method in the following way in my XSL

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xalan = "http://xml.apache.org/xalan"; 
exclude-result-prefixes="xalan"
xmlns:str-utils = "com.xyz.StrUtils" extension-element-prefixes 
="str-utils" >
<xsl:template match="/">
<xsl:for-each select="/colors/color">
<xsl:variable name="color" select="."/>
<xsl:value-of select="str-utils:upperCase($color)"/>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

This works fine too. My question is that in my Example, where is 
the instantiation being done?? I have not done anything like 
com.xyz.StrUtils.new()... so how is it working??
what is the theory behind the object instantiation when it comes 
to extension libraries??

i would be thankful if someone can please tell me about this.


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