Include Paulo Moura's Logtalk OO LP system

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@53 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

Logtalk/examples/roots/abstract_classp.lgt

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+
+:- protocol(abstract_classp).
+
+
+	:- info([
+		version is 1.0,
+		authors is 'Paulo Moura',
+		date is 2000/7/24,
+		comment is 'Default protocol for all abstract classes.']).
+
+
+	:- public(metaclass/0).
+
+	:- mode(metaclass, zero_or_one).
+
+	:- info(metaclass/0, [
+		comment is 'True if the object is a metaclass.']).
+
+
+	:- public(abstract_class/0).
+
+	:- mode(abstract_class, zero_or_one).
+
+	:- info(metaclass/0, [
+		comment is 'True if the object is an abstract class.']).
+
+
+:- end_protocol.