layout – Magento 1 – adds a script to a specific page

I know I can add the script to ALL pages if I put the following code in the Tag of a layout file:


    
        
            
                <![CDATA[[CDATA[[CDATA[[CDATA[]]>
            
        
    

It works.

But I only need this script to be called on the product page!

I've therefore added the following code to app design frontend venedor company layout catalog.xml:



    
        

        
            
                
                    <![CDATA[[CDATA[[CDATA[[CDATA[]]>
                
            
        
        
        
        
        ...

But that does not load the script if I'm on the product page. What are the steps I miss? The cache is disabled.

hint: The script contains only a javascript warning method that displays "hello world".