public Map<String, DapAttribute> getAttributes()
    {
        if(attributes == null) attributes = new HashMap<String, DapAttribute>();
        return attributes;
    }
public Map<String, DapAttribute> getAttributes()
    {
        if(attributes == null) attributes = new HashMap<String, DapAttribute>();
        return attributes;
    }
public Map < String , DapAttribute > getAttributes ( ) { if ( attributes == null ) attributes = new HashMap < String , DapAttribute > ( ) ; return attributes ; }
attributes are not allowed on some node types
attributes are not allowed on some node types