The following identifiers are allowed in any order with restrictions.

A-Z, a-z, 0-9, _ and <space>

Identifier exceptions are:

An identifier may not begin or end with a space.

Example

Valid	A<space>A
Not Valid	<space>A and A<space>

 

A space cannot be followed by another space in identifier names.

Example

Valid	A<space>A
Not Valid	A<space><space>A

An identifier may not be all numbers.

Example

"4x"

Valid	"4<space>_"
Not Valid	"4"

 Reserved identifiers are

Identifier	Reserved by the Query Engine syntax to reference:
"Trk"	Tracker Standard, Extended, and System attributes.
"TADB"	TADB System attributes (e.g. id, refid).

More information

TADB overview.

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