Description of how and with what frequency the sample frame is updated. This element contains the sub-element "concept" to support the use of an external controlled vocabulary. PLEASE NOTE A CHANGE IN USAGE INSTRUCTIONS: The string content of "concept" now contains the language specific label obtained from the controlled vocabulary. This allows for multiple languages through the repeated entry of the "concept" element. The attribute "vocabInstanceCodeTerm" has been added to accommodate the code term as it appears in the controlled vocabulary. See the high level documentation for a complete description of usage. Additional textual description is entered in the mixed text content or using the sub-element "txt".
<updateProcedure>Changes are collected as they occur through registration and loss of phone number from the specified geographic area. Data are compiled for the date June 1st of odd numbered years, and published on July 1st for the following two-year period.</updateProcedure>