Create extended_age_query.md

Author: acwhite211

sphinx/software_desc/extended_age_query.md

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+# Extended Age Query
+
+## Query Paths
+
+Table paths from CollectionObject to Absoluteage or GeologicTimePeriod:
+- collectionobject->absoluteage
+- collectionobject->relativeage->chronostrat
+- collectionobject->paleocontext->chronostrat
+- collectionobject->collectionevent->paleocontext->chronostrat
+- collectionobject->collectionevent->locality->paleocontext->chronostrat
+
+Field Paths from CollectionObject to Absoluteage or GeologicTimePeriod:
+- collectionobject__absoluteage__absoluteage
+- collectionobject__relativeage__agename__startperiod
+- collectionobject__relativeage__agename__endperiod
+- collectionobject__relativeage__agenameend__startperiod
+- collectionobject__relativeage__agenameend__endperiod
+- collectionobject__paleocontext__chronosstrat__startperiod
+- collectionobject__paleocontext__chronosstrat__endperiod
+- collectionobject__paleocontext__chronosstratend__startperiod
+- collectionobject__paleocontext__chronosstratend__endperiod
+- collectionobject__collectingevent__paleocontext__chronosstrat__startperiod
+- collectionobject__collectingevent__paleocontext__chronosstrat__endperiod
+- collectionobject__collectingevent__paleocontext__chronosstratend__startperiod
+- collectionobject__collectingevent__paleocontext__chronosstratend__endperiod
+- collectionobject__collectingevent__locality__paleocontext__chronosstrat__startperiod
+- collectionobject__collectingevent__locality__paleocontext__chronosstrat__endperiod
+- collectionobject__collectingevent__locality__paleocontext__chronosstratend__startperiod
+- collectionobject__collectingevent__locality__paleocontext__chronosstratend__endperiod
+
+## Query Logic
+
+Given:
+- an age query start period `x`
+- an age query end period `y`
+- with constraint that `x >= y`
+- for each collection object, a meta start period `a` is decided, and a meta end period `b` is decided.
+- with constraint that `a >= b`
+
+Strict Filter: (full overlap, a-b is within x-y)
+`a <= x` and `b >= y`
+
+Non-Strict Filter: (partial age range overlap, any overlap so x-y can be within a-b or a-b can be within x-y)
+(` a<= x` and `a >= y`) or (`b <= x` and `b >= y`) or (`a >= x` and `b <= y`)
+
+This is omitting the complication of uncertainty values.
+
+The meta age range for each collection object should appear in the age column of the query results.
+
+The "Any" age query bug is being push to a later issue. For now, do a Age Range query from "13800" to "0" to get all COs with age data (query all of time, the age of the universe 😀
+