--- Revision None
+++ Revision 656434343666
@@ -0,0 +1,53 @@
+{
+_id: "AssemblyA",
+type: "Assembly"
+}
+
+Then you might also have:
+
+{
+_id: "ObjectA",
+"type" : "part"
+"what": "gadget",
+usedIn: [
+	"AssemblyA",
+	"AssemblyB"
+	]
+}
+{
+_id:"ObjectB",
+"what":"widget",
+"usedIn": [
+	"AssemblyA",
+	"AssembyC"
+	]
+}
+etc.
+
+and
+{
+_id:"toolA",
+"type": "tool"
+"what":"screwdriver",
+"usedIn":[
+	"AssemblyA"
+	]
+}
+etc.
+
+Then, in your map function, (this is pseudocode, I didn't actually test it!)
+
+if (type == "Assembly") { emit ([doc._id,'assembly',nil],null); }
+if (type == "tool" || type == "part") {
+	forEach (asm in doc.usedIn) {
+		emit([asm,doc.type,0],null);
+	}
+}
+
+That will get you
+['AssemblyA','assembly',nil]
+['ObjectA','part',0]
+['ObjectB','part',0]
+['ToolA','tool',0]
+
+If you do a query on startkey=['AssemblyA']&endkey['AssemblyA',{}]