Not all available CAP elements are used by HazCollect. Only the essential elements used for composing an NWEM are described in this course, including additional data elements provided at the HazCollect server.
Authoring software may vary in the specific labels that are used for the NWEM data elements, as well as value sources. Ultimately, you will need to consult your software documentation for specific implementation. For purposes of this training, a classification system based on the typical source of the values is used to categorize NWEM data elements.
NWEM Data Element Categories
The four categories are:
Software Derived Values
Elements whose values are usually automatically calculated and supplied by the software are classified in this category.
A comparable example from general usage would be the date and time stamp on an email message, derived from the user's computer system clock.
- User Selected Values
Elements whose values are usually selected by the user from limited range of options are classified in this category.
- A comparable example from general usage would be the selection of a U.S. state code from a pick list on an order form.
- User Composed Values
Elements whose values are entered by the user in free text form are classified in this category.
- A comparable example from general usage would be entering a street address on an order form.
- NWS Supplied Values
Elements whose values are added at the HazCollect server during reformatting are classified in this category.
- An example is the addition of the phrase "BULLETIN - EAS ACTIVATION REQUESTED."
In table form:
| Software Derived | User Selected | User Composed | NWS Supplied |
| senderName | status | headline | WMO Heading |
| identifier | msgType | description | AWIPS ID |
| source | language | instruction | Universal Geo Code (UGC) |
| sent/effective | event | --- | Broadcast Instruction |
| scope | areaDesc | --- | NWS Relaying Office |
| eventCode | expires | --- | Relay Text |
| reference | --- | --- | --- |
The purpose of each of these elements, as well as applicable restrictions, will be described in the next four lessons.
Check your knowledge via the self-assessment quiz on the next page.
Check your knowledge via the self-assessment quiz on the next page.