diff --git a/src/Makefile b/src/Makefile
index 117e16b..d842505 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -8,7 +8,7 @@ SRC_PATH = ${PSS_HOME}/src
 ANTLR4 = java -jar $(ANTLR4_JAR_PATH)
 GRUN = java -classpath $(PSSGEN_JAR_PATH):$(ANTLR4_JAR_PATH) org.antlr.v4.gui.TestRig PSS model -gui -f
 
-JAVAC = javac -classpath $(SRC_PATH):$(ANTLR4_JAR_PATH)
+JAVAC = javac --release 13 -classpath $(SRC_PATH):$(ANTLR4_JAR_PATH)
 
 PSSGEN = java -classpath $(PSSGEN_JAR_PATH):$(ANTLR4_JAR_PATH) PSSGenMain
 
diff --git a/src/PSSEnumInst.java b/src/PSSEnumInst.java
index 0a0b19d..5439752 100644
--- a/src/PSSEnumInst.java
+++ b/src/PSSEnumInst.java
@@ -1,8 +1,19 @@
-import java.util.*;
+import java.math.BigInteger;
 
 public class PSSEnumInst extends PSSIntInst {
 
-	public PSSEnumInst(String id, String type, PSSModel type_decl, boolean rand) {
+	public PSSEnumInst(String id, String type, PSSEnumModel type_decl, boolean rand) {
 		super(id, rand, 32, true);
+
+		/*
+		 * PSS 2.0, Section 8.4 Enumeration types:
+		 * When not initialized, the default value of an enum field shall be the first
+		 * enum_item in the list. This is not necessarily the value 0 nor the enum_item
+		 * with the minimum value.
+		 */
+		String[] items = type_decl.getEnumItems();
+		if (items.length > 0) {
+			m_val = new PSSIntVal(BigInteger.valueOf(type_decl.getEnumItemValue(items[0])));
+		}
 	}
 }
diff --git a/src/PSSEnumModel.java b/src/PSSEnumModel.java
index 17ca367..85aebc6 100644
--- a/src/PSSEnumModel.java
+++ b/src/PSSEnumModel.java
@@ -2,16 +2,35 @@
 
 public class PSSEnumModel extends PSSModel {
 
-	private HashMap<String, Integer> m_items;
+	private LinkedHashMap<String, Integer> m_items;
 
 	private Integer m_default_val;
 
 	public PSSEnumModel(String id) {
 		super(id);
-		m_items = new HashMap<String, Integer>();
+		m_items = new LinkedHashMap<String, Integer>();
 		m_default_val = 0;
 	}
 
+	/**
+	 * Returns items in this enum.
+	 *
+	 * @return items in this enum.
+	 */
+	public String[] getEnumItems() {
+		return m_items.keySet().toArray(new String[0]);
+	}
+
+	/**
+	 * Returns the value of a specified item in this enum.
+	 *
+	 * @param item an item in this enum
+	 * @return the value of item in this enum
+	 */
+	public int getEnumItemValue(String item) {
+		return m_items.get(item);
+	}
+
 	public void addEnumItem(String id) {
 		m_items.put(id, m_default_val);
 		m_default_val++;
diff --git a/src/PSSInst.java b/src/PSSInst.java
index 02e3307..af82e8d 100644
--- a/src/PSSInst.java
+++ b/src/PSSInst.java
@@ -170,13 +170,15 @@ public PSSInst findInstanceUnder(String hierarchy_id) {
 
 	public PSSInst findStaticInst(String hierarchiy_id) {
 		// Currently, find enum items only.
+		PSSInst res = null;
 		PSSModel m = getTypeModel();
-		while (!(m instanceof PSSComponentModel) && m != null)
+		while (m != null) {
+			res = m.findStaticInst(hierarchiy_id);
+			if (res != null)
+				break;
 			m = m.m_parent;
-		if (m != null) {
-			return m.findStaticInst(hierarchiy_id);
 		}
-		return null;
+		return res;
 	}
 
 	public PSSInst findInstance(String hierarchy_id, boolean local_scope) {
diff --git a/src/PSSMemberPathElemExpression.java b/src/PSSMemberPathElemExpression.java
index 31ff18a..b2423d6 100644
--- a/src/PSSMemberPathElemExpression.java
+++ b/src/PSSMemberPathElemExpression.java
@@ -157,9 +157,12 @@ private PSSExecKind getContextExecKind(PSSInst inst) {
      */
     private PSSInst getInstOne(PSSModel pkg, PSSInst ctx, PSSInst parent) {
         PSSInst inst = null;
-
         if (m_function_parameter_list == null) {
-            inst = m_parent == null ? ctx.findInstance(m_id) : parent.findInstanceUnder(m_id);
+            if (pkg == null || m_parent != null) {
+                inst = m_parent == null ? ctx.findInstance(m_id) : parent.findInstanceUnder(m_id);
+            } else {
+                inst = pkg.findStaticInst(m_id);
+            }
             if (inst == null)
                 PSSMessage.Error("PSSMemberPathElemExpression", getUpperHierarchicalID() + " is not defined.");
         } else if (m_parent == null || parent instanceof PSSComponentInst) {
@@ -188,7 +191,8 @@ private PSSInst getInstOne(PSSModel pkg, PSSInst ctx, PSSInst parent) {
                     PSSMessage.Error("PSS 2.0 Section 22.4.1.3",
                             "The function call " + getUpperHierarchicalID() + "("
                                     + String.join(", ",
-                                            m_function_parameter_list.stream().map(p -> p.getText()).collect(Collectors.toList()))
+                                            m_function_parameter_list.stream().map(p -> p.getText())
+                                                    .collect(Collectors.toList()))
                                     + ") is not available in its platform "
                                     + k + ".");
                 }
@@ -255,6 +259,21 @@ private PSSInst getInst(PSSModel pkg, PSSInst ctx, PSSInst parent) {
         return inst;
     }
 
+    /**
+     * Resolve the whole hierarchical reference path.
+     *
+     * @param pkg an optional package containing m_id (m_parent != null implies
+     *            pkg == null)
+     * @param var the containing instance
+     * @return the resolved instance of the whole hierarchical reference path
+     */
+    public PSSInst getInst(PSSModel pkg, PSSInst var) {
+        if (m_parent != null)
+            PSSMessage.Error("PSSMemberPathElemExpression",
+                    "Cannot evaluate a partial member path reference: " + getLowerHierarchicalID());
+        return getInst(pkg, var, var);
+    }
+
     @Override
     public PSSInst getInst(PSSInst var) {
         if (m_parent != null)
diff --git a/src/PSSModel.java b/src/PSSModel.java
index 588cf72..b83ee76 100644
--- a/src/PSSModel.java
+++ b/src/PSSModel.java
@@ -131,9 +131,9 @@ public void declEnumInst(PSSInst inst) {
 
 			child.declEnumItem(inst);
 		}
-		// if (m_parent != null) {
-		// m_parent.declEnumInst(inst);
-		// }
+		if (m_parent != null) {
+			m_parent.declEnumInst(inst);
+		}
 	}
 
 	public void init_up(PSSInst inst) {
diff --git a/src/PSSRefPathExpression.java b/src/PSSRefPathExpression.java
index 177a758..791c685 100644
--- a/src/PSSRefPathExpression.java
+++ b/src/PSSRefPathExpression.java
@@ -75,11 +75,14 @@ public static PSSRefPathExpression fromString(PSSModel root, String str) {
 
 	@Override
 	public PSSInst getInst(PSSInst var) {
+		PSSInst inst = null;
 		if (m_type_identifier_elems != null && !m_type_identifier_elems.equals("")) {
-			PSSMessage.Fatal("[" + getClass().getName() + "] type_identifier_elems is not implemented");
+			PSSModel m = var.getTypeModel().findDeclaration(m_type_identifier_elems);
+			inst = m_ref_path.getInst(m, var);
+		} else {
+			inst = m_ref_path.getInst(var);
 		}
 
-		PSSInst inst = m_ref_path.getInst(var);
 		if (m_bit_slice_from != null && m_bit_slice_to != null)
 			PSSMessage.Fatal("[" + getClass().getName() + "] bit_slice is not implemented");