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This is a dereferencable locator for some instance. For example, a bunch of radiology images that can be retrieved on demand. A given instance of this data type may not be valid forever.
This is an arbitrary address string that must be meaningful to the protocol.
The purpose of the "use code" is to advise in a system or user's selecting an appropriate telecommunication address to reach a party for a given telecommunication need. The following mandatory value domain is defined:
PR - primary residence (home)
OR - other residence (other home)
WP - work/business/office communication address
VR - vacation residence
AS - automated answering service
EC - emergency contact
BP - beeper/pager
CL - cellular/wireless phone
This is a General Time Specification (GTS) that identifies the periods of time during which this telecommunication address can be used. For a telephone number this can indicate the time of day in which the party can be reached on that telephone. For a web address, it may specify a time range in which the web content is promised to be available under the given address.