ORA-31187
        cannot add node 'node_name' (type='node_type') to simple type node 'simple_type_node'
        - node_name: The node added to the simple type node.
- node_type: The node type added to the simple type node.
- simple_type_node: The node that is the simple type node.
        Cause
        An attempt was made to add attribute or element nodes to a simple type against the schema definition. But, a simple type can only have special attributes like namespaces or xsi:nil.
        Action
        Add a node complying with the simple type.
        
     
    
    
        ORA-31187
        Cannot Add Node 'string' (type='string') to Simple Type Node 'string'
        
        
        Cause
        Trying to add attribute/element nodes to a simple type against the schema definition. Simple types can have only special attribute like namespaces, xsi:nil etc.
        Action
        Use a valid node for the operation.
        
     
    
    
        ORA-31187
        Cannot Add Node 'string' (type='string') to Simple Type Node 'string'
        
        
        Cause
        Trying to add attribute/element nodes to a simple type against the schema definition. Simple types can have only special attribute like namespaces, xsi:nil etc.
        Action
        Use a valid node for the operation.