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diff --git a/org.argeo.slc.core/src/org/argeo/slc/core/execution/PrimitiveSpecAttribute.java b/org.argeo.slc.core/src/org/argeo/slc/core/execution/PrimitiveSpecAttribute.java
new file mode 100644
index 000000000..fe8412c81
--- /dev/null
+++ b/org.argeo.slc.core/src/org/argeo/slc/core/execution/PrimitiveSpecAttribute.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.slc.core.execution;
+
+import org.argeo.slc.SlcException;
+
+/**
+ * A spec attribute wrapping a primitive value.
+ * 
+ * @see PrimitiveAccessor
+ */
+public class PrimitiveSpecAttribute extends AbstractSpecAttribute implements
+		PrimitiveAccessor {
+	private static final long serialVersionUID = -566676381839825483L;
+	private String type = "string";
+	private Object value = null;
+
+	public PrimitiveSpecAttribute() {
+	}
+
+	public PrimitiveSpecAttribute(String type, Object value) {
+		this.type = type;
+		this.value = value;
+	}
+
+	public Object getValue() {
+		return value;
+	}
+
+	public void setValue(Object value) {
+		this.value = value;
+	}
+
+	public String getType() {
+		return type;
+	}
+
+	public void setType(String type) {
+		// check whether type is recognized.
+		if (PrimitiveUtils.typeAsClass(type) == null)
+			throw new SlcException("Unrecognized type " + type);
+		this.type = type;
+
+	}
+
+	@Override
+	public String toString() {
+		return "Primitive spec attribute [" + type + "]"
+				+ (value != null ? "=" + value : "");
+	}
+
+}