In XSLT, how come I can't set the select-attribute of a value-of using xsl:attribute, and what's a good alternative?

Question

I have a constant and a variable that I wann mouch together to select a specific node, this is what I want to do:

Answer 1

While @Alejandro is right that in the general case dynamic evaluation will be needed (and this may be provided in XSLT 2.1+), there are manageable simpler cases.

For example, if $inputid contains just a name, you probably want this:

We can implement a rather general dynamic XPath evaluator if we only restrict each location path to be an element name:

 

 

 

 
  : 

  
    
  
 

 
   
   

   
    
      
    
    
      
        
        
      
    
   
 

when this transformation is applied on this XML document:

  
    
      
        
          5
        
      
      
        
          8
        
      
    
  

the wanted, correct result is produced:

root/meta/url_params/param/yyy/value: 8