Java namespace

First, let me tell i'm not a expertise in these areas, so bear with me...

When i declare a namespace pointing to a Java class, is that Java class treated
as a Static class? Or does the XSL processor somehow instatiates a object of
that class?

I'm asking this cause i have this situation:

<?xml version="1.0" encoding="ISO8859-1" ?>
<xsl:stylesheet version="2.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      	xmlns:gti = "SQLHelper" >

(...)
            <xsl:element name="ResultSet">
      		  <xsl:attribute name="sql"><xsl:value-of
select="gti:AcertaSqlReservado($sql)"/></xsl:attribute>
            </xsl:element>

This XSLT is called by a Java program

public class Tester{
  public static void main(String[] args) {
    try {
      BufferedReader br = new BufferedReader(new InputStreamReader(new
FileInputStream(xin+".xml")));
      PrintWriter out = new PrintWriter(new FileOutputStream(xout+".xml"));
      try {
        TransformerFactory xformFactory = TransformerFactory.newInstance();
        Source xsl = new StreamSource("Testes12.xsl");
        Transformer stylesheet = xformFactory.newTransformer(xsl);
        Source request = new StreamSource(br);
        Result response = new StreamResult(out);
        //stylesheet.setParameter("gui", "awt");
        stylesheet.transform(request, response);
      }
      catch (TransformerException e) {
        System.err.println(e);
      }
    }
    catch (FileNotFoundException e) {
      System.err.println(e);
    }
  }
  }

This works OK, but if i change the XSL to

<?xml version="1.0" encoding="ISO8859-1" ?>
<xsl:stylesheet version="2.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      	xmlns:gti = "Tester"   ---> the same Java class that call the XSLT

i got a TransformerException.

But i don't understand why.

Thanks all.






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