diff --git a/src/oselect/main.cr b/src/oselect/main.cr
index e296136..dc1d87a 100644
--- a/src/oselect/main.cr
+++ b/src/oselect/main.cr
@@ -42,8 +42,7 @@ class SelectApplication
 		# 1.1 get rules and stuff.
 		intent = ARGV[0]
 
-		case intent
-
+		proc = case intent
 		# String comparison.
 		when /(?<attribute>[^ ]+)[ ]*(?<comparison>(eq|neq|=~)+)[ ]*(?<value>[^ ]+)/
 			attribute = $~["attribute"]
@@ -51,17 +50,51 @@ class SelectApplication
 			value = $~["value"]
 			pp! "string comparison", attribute, comparison, value
 
+			->(v : JSON::Any | CBOR::Any) {
+				case comparison
+				when /neq/
+					puts "attribute #{attribute} shouldn't be equal to #{value}"
+				when /eq/
+					puts "attribute #{attribute} should be equal to #{value}"
+				when /=~/
+					puts "attribute #{attribute} should match #{value}"
+				else
+					raise "string comparison '#{comparison}' not understood"
+				end
+			}
+
 		# Numerical comparison.
 		when /(?<attribute>[^ ]+)[ ]*(?<comparison>[=<>]+)[ ]*(?<value>[^ ]+)/
 			attribute = $~["attribute"]
 			comparison = $~["comparison"]
 			value = $~["value"]
 			pp! "numerical comparison", attribute, comparison, value
+
+			->(v : JSON::Any | CBOR::Any) {
+				case comparison
+				when /!=/
+					puts "attribute #{attribute} shouldn't be equal to #{value}"
+				when /==/
+					puts "attribute #{attribute} should be equal to #{value}"
+				when />=/
+					puts "attribute #{attribute} should be greater or equal than #{value}"
+				when /<=/
+					puts "attribute #{attribute} should be less or equal than #{value}"
+				when />/
+					puts "attribute #{attribute} should be greater than #{value}"
+				when /</
+					puts "attribute #{attribute} should be less than #{value}"
+				else
+					raise "numerical comparison '#{comparison}' not understood"
+				end
+			}
 		else
 			STDERR.puts "cannot understand the intent of #{intent}"
 			exit 1
 		end
 
+		proc.call CBOR::Any.new "this is my attribute"
+
 		# TODO: FIXME
 		exit 0