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Disallow arbitrarily nested Boolean formulae #58

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Disallow arbitrarily nested Boolean formulae #58

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27 changes: 15 additions & 12 deletions mef/schema/formula.rnc
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Original file line number Diff line number Diff line change
@@ -1,23 +1,26 @@
formula =
event
| Boolean-constant
| element and { formula+ }
| element or { formula+ }
| element not { formula }
| element xor { formula+ }
| element iff { formula+ }
| element nand { formula+ }
| element nor { formula+ }
argument
| element and { argument+ }
| element or { argument+ }
| element xor { argument+ }
| element iff { argument+ }
| element nand { argument+ }
| element nor { argument+ }
| element atleast {
attribute min { xsd:positiveInteger },
formula+
argument+
}
| element cardinality {
attribute min { xsd:nonNegativeInteger },
attribute max { xsd:nonNegativeInteger },
formula+
argument+
}
| element imply { formula, formula }
| element imply { argument, argument }

argument =
event
| element not { event }
| Boolean-constant

event =
element event {
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