NAME
blx::xsdsql::common_interfaces - class for common methods
get_attrs_value - generic method for return value of attribute
the params is a list of attributes name
the method return a list of values or a value if the params is one
set_attrs_value - generic method for set a value of attribute the params are a pair of NAME => VALUE the method return a self object
shallow_clone - return a shallow clone of the self object