diff --git a/include/plasp/pddl/Context.h b/include/plasp/pddl/Context.h
index 52b182b..7d01495 100644
--- a/include/plasp/pddl/Context.h
+++ b/include/plasp/pddl/Context.h
@@ -10,6 +10,7 @@
 #include <plasp/pddl/expressions/Constant.h>
 #include <plasp/pddl/expressions/PredicateDeclaration.h>
 #include <plasp/pddl/expressions/PrimitiveType.h>
+#include <plasp/utils/Logger.h>
 
 namespace plasp
 {
@@ -31,6 +32,7 @@ class Context
 		}
 
 		utils::Parser &parser;
+		utils::Logger logger;
 
 		expressions::PrimitiveTypes primitiveTypes;
 		//std::unordered_map<std::string, expressions::PrimitiveType *> primitiveTypesHashMap;
diff --git a/include/plasp/utils/Logger.h b/include/plasp/utils/Logger.h
new file mode 100644
index 0000000..c8b47f9
--- /dev/null
+++ b/include/plasp/utils/Logger.h
@@ -0,0 +1,37 @@
+#ifndef __PLASP__UTILS__LOGGER_H
+#define __PLASP__UTILS__LOGGER_H
+
+#include <string>
+
+#include <plasp/utils/Parser.h>
+
+namespace plasp
+{
+namespace utils
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Logger
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+class Logger
+{
+	public:
+		Logger();
+
+		void setPedantic(bool isPedantic = true);
+
+		void parserWarning(const Parser &parser, const std::string &text);
+
+	private:
+		bool m_isPedantic;
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+
+#endif
diff --git a/src/plasp/pddl/expressions/PrimitiveType.cpp b/src/plasp/pddl/expressions/PrimitiveType.cpp
index de09e1b..14bfae4 100644
--- a/src/plasp/pddl/expressions/PrimitiveType.cpp
+++ b/src/plasp/pddl/expressions/PrimitiveType.cpp
@@ -129,7 +129,7 @@ PrimitiveType *PrimitiveType::parseExisting(Context &context)
 	{
 		// Primitive type "object" is implicitly declared
 		if (typeName != "object")
-			throw ConsistencyException("Primitive type \"" + typeName + "\" used but never declared");
+			context.logger.parserWarning(context.parser, "Primitive type \"" + typeName + "\" used but never declared");
 
 		return create(typeName, context);
 	}
diff --git a/src/plasp/utils/Logger.cpp b/src/plasp/utils/Logger.cpp
new file mode 100644
index 0000000..fa3d0aa
--- /dev/null
+++ b/src/plasp/utils/Logger.cpp
@@ -0,0 +1,41 @@
+#include <plasp/utils/Logger.h>
+
+#include <plasp/utils/ParserWarning.h>
+
+namespace plasp
+{
+namespace utils
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Logger
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+Logger::Logger()
+:	m_isPedantic{false}
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Logger::setPedantic(bool isPedantic)
+{
+	m_isPedantic = isPedantic;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Logger::parserWarning(const Parser &parser, const std::string &text)
+{
+	if (m_isPedantic)
+		throw ParserWarning(parser, text);
+
+	std::cerr << "Warning: " << parser.row() << ":" << parser.column() << "\t" << text << std::endl;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}