get_attribute_value
Description:
[ CCode ( vfunc_name = "get_document_attribute_value" ) ]
[ Version ( since = "1.12" ) ]
public virtual unowned string? get_attribute_value (string attribute_name)
  [ Version ( since = "1.12" ) ]
public virtual unowned string? get_attribute_value (string attribute_name)
Retrieves the value of the given attribute_name inside this.
Parameters:
| this | 
           a Object instance that implements AtkDocumentIface  | 
      
| attribute_name | 
           a character string representing the name of the attribute whose value is being queried.  | 
      
Returns:
| 
           a string value associated with the named attribute for this document, or   |