EDK II VFR Specification
1.0.0
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2.10 VFR General Token Definition

2.10.1 GUID Definition

Hex8 ::=
"0x"["0"-"9""A"-"F""a"-"f"]{1,8}
Hex4 ::=
"0x"["0"-"9""A"-"F""a"-"f"]{1,4}
Hex2 ::=
"0x"["0"-"9""A"-"F""a"-"f"]{1,2}
guidSubDefinition ::=
Hex2 "," Hex2 "," Hex2 "," Hex2 ","
Hex2 "," Hex2 "," Hex2 "," Hex2
guidDefinition ::=
"{"
Hex8 "," Hex4 "," Hex4 ","
(
"{" guidSubDefinition "}"
| guidSubDefinition
)
"}"

BEHAVIORS AND RESTRICTIONS

In practice, the VFR only supports GUIDs in a C-style language structure. It is defined as two 32-bit values, followed by two 16-bit values, followed by eight 1-byte values.

2.10.2 String & String Identifier Definition

StringIdentifier ::=
["A"-"Z""a"-"z""_"]["A"-"Z""a"-"z""_""0"-"9"]*
getStringId ::=
"STRING_TOKEN" "(" Number ")"
Note: There are no BEHAVIORS AND RESTRICTIONS or an Example for this section.

2.10.3 Number Definition

Number ::=
( "0x"["0"-"9""A"-"F""a"-"f"]+ ) | ["0"-"9"]+
Note: There are no BEHAVIORS AND RESTRICTIONS or an Example for this section.

2.10.4 VFR Statement Header Definition

vfrStatementHeader ::=
"prompt" "=" getStringId ","
"help" "=" getStringId ","
Note: There are no BEHAVIORS AND RESTRICTIONS or an Example for this section.

2.10.5 VFR Question Header Definition

vfrQuestionHeader ::=
{ "name" "=" StringIdentifier "," }
{ "varid" "=" vfrStorageVarId "," }
{ "questionid" "=" Number "," }
vfrStatementHeader
questionheaderFlagsField ::=
"READ_ONLY"
| "INTERACTIVE"
| "RESET_REQUIRED"
| "OPTIONS_ONLY"
| "REST_STYLE"
vfrStorageVarId ::=
( StringIdentifier "[" Number "]" )
|
(
StringIdentifier
(
"." StringIdentifier { "[" Number "]" }
)*
)

BEHAVIORS AND RESTRICTIONS

Note: questionid is used to specify the question ID. If it is not defined, the compiler automatically assigns a unique ID.
Note: name is used to specify the reference name, which is optional.
Note: The first StringIdentifier defined in vfrStorageVarId is the varstore name or the structure name referred by varstore. When the same structure is referred to by more than one varstore statement, only the varstore name can be used here. If it is not defined, this question has no storage.

Example

None.

2.10.6 VFR Constant Value Definition

vfrConstantValueField ::=
Number
| "TRUE"
| "FALSE"
| "ONE"
| "ONES"
| "ZERO"
| Number ":" Number ":" Number
| Number "/" Number "/" Number
| "STRING_TOKEN" "(" Number ")"
| { Number ("," Number)* }
Note: There are no BEHAVIORS AND RESTRICTIONS or an Example for this section.

2.10.7 VFR Statement Image & Locked Tag Definition

vfrImageTag ::=
"image" "=" "IMAGE_TOKEN" "(" Number ")"
vfrLockedTag ::=
"locked"
vfrStatementStatTag ::=
vfrImageTag | vfrLockedTag
vfrStatementStatTagList ::=
vfrStatementStatTag ( "," vfrStatementStatTag )*
Note: There are no BEHAVIORS AND RESTRICTIONS or an Example for this section.