When attempting a sample webservice (SOAP request, using PHP), I'm getting an error that the function is Not Found

I'm trying to follow the sample script here:

http://www.oreillynet.com/pub/a/php/2007/07/26/php-web-services.html

I'm using my ISP account, and I've created a folder called 'webservice' under the main root (http://mydomain.com/webservice/) under which I have placed the sample files catalog.wsdl, soap_client.php, and soap_server.php

I'm a novice at php and know NOTHING about soap, so this is a stretch assignment for me.  In the service block of the WSDL (posted below) I cnaged the tag:
<soap:address location='http://localhost/soap-server.php'/>
to
<soap:address location='http://mydomain.com/webservice/soap-server.php'/>

but  Istill get the error message:

Fatal error: Uncaught SoapFault exception: [HTTP] Not Found in /home/paul/public_html/webservice/soap-client.php:4 Stack trace: #0 [internal function]: SoapClient->__doRequest('<?xml version="...', 'http://localhos...', 'urn:localhost-c...', 1, 0) #1 [internal function]: SoapClient->__call('getCatalogEntry', Array) #2 /home/paul/public_html/webservice/soap-client.php(4): SoapClient->getCatalogEntry('catalog1') #3 {main} thrown in /home/paul/public_html/webservice/soap-client.php on line 4

<?xml version ='1.0' encoding ='UTF-8' ?> 
<definitions name='Catalog'
  targetNamespace='http://mydomain.com/webservice/catalog'
  xmlns:tns='http://mydomain.com/webservice/catalog'
  xmlns:soap='http://schemas.xmlsoap.org/wsdl/soap/'
  xmlns:xsd='http://www.w3.org/2001/XMLSchema'
  xmlns:soapenc='http://schemas.xmlsoap.org/soap/encoding'
  xmlns:wsdl='http://schemas.xmlsoap.org/wsdl/' 
  xmlns='http://schemas.xmlsoap.org/wsdl/'> 
 
<message name='getCatalogRequest'> 
  <part name='catalogId' type='xsd:string'/> 
</message> 
<message name='getCatalogResponse'> 
  <part name='Result' type='xsd:string'/> 
</message> 
 
<portType name='CatalogPortType'> 
  <operation name='getCatalogEntry'> 
    <input message='tns:getCatalogRequest'/> 
    <output message='tns:getCatalogResponse'/> 
  </operation> 
</portType> 
 
<binding name='CatalogBinding' type='tns:CatalogPortType'> 
  <soap:binding style='rpc' 
    transport='http://schemas.xmlsoap.org/soap/http'
  /> 
  <operation name='getCatalogEntry'> 
    <soap:operation soapAction='urn:localhost-catalog#getCatalogEntry'/> 
    <input> 
      <soap:body use='encoded' namespace='urn:localhost-catalog' 
        encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'/> 
    </input> 
    <output> 
      <soap:body use='encoded' namespace='urn:localhost-catalog' 
        encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'/> 
    </output> 
  </operation> 
</binding> 
 
<service name='CatalogService'> 
  <port name='CatalogPort' binding='CatalogBinding'> 
    <soap:address location='http://mydomain.com/webservice/soap-server.php'/> 
  </port> 
</service>
</definitions>

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