Elements 'xbrli:identifier' of all contexts MUST specify attribute 'scheme' with value 'http://www.duo.nl/bevoegdgezagnummer'. The contents of element 'xbrli:identifier' MUST specify at most 10 alphanumeric characters. Element 'xbrli:identifier' of all contexts MUST specify the same value. Numeric facts MUST be reported with attribute value decimals="INF".