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A flag to set to indicate the preferred telephone number for the administrative contact for the unit record.
---+++++ Content
The telephone number marked as preferred by means of this attribute should be the first approached. The other telephone numbers should be regarded as alternative numbers.
---++++ Recommended or Prescribed Values
true, false, or empty. For a single unbounded element there should only be one with the @preferred attribute set to true.
---+++++ Example Value
true
---+++++ Example Explanation
The element with its attribute set to true is the preferred telephone number.