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The following ABNF definition specifies the Brief Syntax of the SNOMED CT Expression Constraint Language.
...
expressionConstraint
...
=
...
ws
...
(
...
refinedExpressionConstraint
...
/
...
compoundExpressionConstraint
...
/
...
dottedExpressionConstraint / subExpressionConstraint ) ws
refinedExpressionConstraint = subExpressionConstraint ws ":" ws eclRefinement
compoundExpressionConstraint = conjunctionExpressionConstraint / disjunctionExpressionConstraint / exclusionExpressionConstraint
conjunctionExpressionConstraint = subExpressionConstraint 1*(ws conjunction ws subExpressionConstraint)
disjunctionExpressionConstraint = subExpressionConstraint 1*(ws disjunction ws subExpressionConstraint)
exclusionExpressionConstraint = subExpressionConstraint ws exclusion ws subExpressionConstraint
dottedExpressionConstraint = subExpressionConstraint 1*(ws dottedExpressionAttribute)
dottedExpressionAttribute = dot ws eclAttributeName
subExpressionConstraint = [constraintOperator ws] [memberOf ws] (eclFocusConcept / "(" ws expressionConstraint ws ")")
eclFocusConcept = eclConceptReference / wildCard
dot = "."
memberOf = "^"
eclConceptReference = conceptId [ws "|" ws term ws "|"]
conceptId = sctId
term = 1*nonwsNonPipe *( 1*SP 1*nonwsNonPipe )
wildCard = "*"
constraintOperator = childOf / descendantOrSelfOf / descendantOf / parentOf / ancestorOrSelfOf / ancestorOf
descendantOf = "<"
descendantOrSelfOf = "<<"
childOf = "<!"
ancestorOf = ">"
ancestorOrSelfOf = ">>"
parentOf = ">!"
conjunction = (("a"/"A")
...
("n"/"N")
...
("d"/"D")
...
mws)
...
/
...
","
...
disjunction
...
=
...
("o"/"O")
...
("r"/"R")
...
mws
...
exclusion
...
=
...
("m"/"M")
...
("i"/"I")
...
("n"/"N")
...
("u"/"U")
...
("s"/"S")
...
mws
...
...
eclRefinement =
...
subRefinement
...
ws
...
[conjunctionRefinementSet
...
/
...
disjunctionRefinementSet]
...
conjunctionRefinementSet
...
=
...
1*(ws
...
conjunction
...
ws
...
subRefinement)
...
disjunctionRefinementSet
...
=
...
1*(ws
...
disjunction
...
ws
...
subRefinement)
...
subRefinement
...
=
...
eclAttributeSet / eclAttributeGroup / "("
...
ws
...
eclRefinement ws
...
")"
...
eclAttributeSet =
...
subAttributeSet
...
ws
...
[conjunctionAttributeSet
...
/
...
disjunctionAttributeSet]
...
conjunctionAttributeSet
...
=
...
1*(ws
...
conjunction
...
ws
...
subAttributeSet)
...
disjunctionAttributeSet
...
=
...
1*(ws
...
disjunction
...
ws
...
subAttributeSet)
...
subAttributeSet
...
=
...
eclAttribute /
...
"("
...
ws
...
eclAttributeSet ws
...
")"
...
eclAttributeGroup = ["[" cardinality "]" ws] "{"
...
ws
...
eclAttributeSet ws
...
"}"
...
eclAttribute = ["[" cardinality "]" ws] [reverseFlag ws] eclAttributeName ws (expressionComparisonOperator ws subExpressionConstraint / numericComparisonOperator ws "#" numericValue / stringComparisonOperator ws QM stringValue QM)
cardinality = minValue to maxValue
minValue = nonNegativeIntegerValue
to = ".."
...
maxValue
...
=
...
nonNegativeIntegerValue
...
/
...
many
...
many
...
=
...
"*"
...
reverseFlag
...
=
...
"R"
...
eclAttributeName = subExpressionConstraint
expressionComparisonOperator = "=" / "!="
...
...
numericComparisonOperator
...
=
...
"="
...
/
...
"!="
...
/
...
"<="
...
/
...
"<"
...
/
...
">="
...
/
...
">"
...
stringComparisonOperator
...
=
...
"="
...
/
...
"!="
...
...
numericValue
...
= ["-"/"+"] (decimalValue / integerValue)
...
stringValue
...
=
...
1*(anyNonEscapedChar
...
/
...
escapedChar)
...
...
integerValue
...
= digitNonZero *digit / zero
decimalValue = integerValue "." 1*digit
nonNegativeIntegerValue = (digitNonZero *digit ) / zero
sctId = digitNonZero 5*17( digit )
ws = *( SP / HTAB / CR / LF / comment ) ; optional white space
mws = 1*( SP / HTAB / CR / LF / comment ) ; mandatory white space
comment = "/*" *(nonStarChar / starWithNonFSlash) "*/"
nonStarChar = SP / HTAB / CR / LF / %x21-29 / %x2B-7E /UTF8-2 / UTF8-3 / UTF8-4
starWithNonFSlash = %x2A nonFSlash
nonFSlash = SP / HTAB / CR / LF / %x21-2E / %x30-7E /UTF8-2 / UTF8-3 / UTF8-4
SP = %x20 ; space
HTAB = %x09 ; tab
CR = %x0D ; carriage return
LF = %x0A ; line feed
QM = %x22 ; quotation mark
BS = %x5C ; back slash
digit = %x30-39
zero = %x30
digitNonZero = %x31-39
nonwsNonPipe = %x21-7B / %x7D-7E / UTF8-2 / UTF8-3 / UTF8-4
anyNonEscapedChar = SP / HTAB / CR / LF / %x20-21 / %x23-5B / %x5D-7E / UTF8-2 / UTF8-3 / UTF8-4
escapedChar = BS QM / BS BS
UTF8-2 = %xC2-DF UTF8-tail
UTF8-3 = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2( UTF8-tail ) / %xED %x80-9F UTF8-tail / %xEE-EF 2( UTF8-tail )
UTF8-4 = %xF0 %x90-BF 2( UTF8-tail ) / %xF1-F3 3( UTF8-tail ) / %xF4 %x80-8F 2( UTF8-tail )
UTF8-tail = %x80-BF
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