Add "probability" & "occurrence" in importance report

The idea is borrowed from XFTA.
open-psa · Oct 4, 2017 · 32c6669 · 32c6669
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diff --git a/mef/report_layer.rst b/mef/report_layer.rst
@@ -124,6 +124,11 @@ The following importance factors are long-established and commonly calculated:
 
 The definitions of these factors can be found in PSA/PRA literature.
 
+In addition to the importance factors,
+this report section may contain
+the evaluated probability of an event and
+the number of products it occurs in.
+
 .. literalinclude:: schema/importance_factors.rnc
     :name: schema_importance_factors
     :caption: The RNC schema for the XML representation of importance factors

diff --git a/mef/schema/importance_factors.rnc b/mef/schema/importance_factors.rnc
@@ -9,6 +9,8 @@ importance =
 importance-event =
   element basic-event {
     name,
+    attribute occurrence { xsd:nonNegativeInteger }?,
+    attribute probability { xsd:double }?,
     attribute DIF { xsd:double }?,
     attribute MIF { xsd:double }?,
     attribute CIF { xsd:double }?,