get_string
  
  Description:
  public unowned string get_string (
string name)
  
 
  
    A slightly more efficient version of get_value for string values 
      avoiding a duplication.
     Otherwise it behaves the same get_value.
    Parameters:
    
      
        | this | 
        
           A MetadataStore 
         | 
      
      
        | name | 
        
           Metadata name 
         | 
      
    
    Returns: