diff --git a/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp b/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp
index 160c3183a..25e1e12f8 100644
--- a/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp
+++ b/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp
@@ -14,6 +14,7 @@
 
 /* Headers from openfpga util library */
 #include "openfpga_port_parser.h"
+#include "openfpga_pb_parser.h"
 
 /* Headers from libarchfpga */
 #include "arch_error.h"
@@ -80,14 +81,36 @@ void read_xml_pb_type_annotation(pugi::xml_node& xml_pb_type,
   if ( (false == name_attr.empty()) 
     && (false == physical_name_attr.empty()) ) {
     /* Parse the attributes for operating pb_type */
-    pb_type_annotation.set_operating_pb_type_name(name_attr);
-    pb_type_annotation.set_physical_pb_type_name(physical_name_attr);
+    openfpga::PbParser operating_pb_parser(name_attr);
+    pb_type_annotation.set_operating_pb_type_name(operating_pb_parser.leaf());
+    if (0 < operating_pb_parser.parents().size()) {
+      pb_type_annotation.set_operating_parent_pb_type_names(operating_pb_parser.parents());
+    }
+    if (0 < operating_pb_parser.modes().size()) {
+      pb_type_annotation.set_operating_parent_mode_names(operating_pb_parser.modes());
+    }
+
+    openfpga::PbParser physical_pb_parser(physical_name_attr);
+    pb_type_annotation.set_physical_pb_type_name(physical_pb_parser.leaf());
+    if (0 < physical_pb_parser.parents().size()) {
+      pb_type_annotation.set_physical_parent_pb_type_names(physical_pb_parser.parents());
+    }
+    if (0 < physical_pb_parser.modes().size()) {
+      pb_type_annotation.set_physical_parent_mode_names(physical_pb_parser.modes());
+    }
   } 
 
   /* If there is only a name, this is a physical pb_type */
   if ( (false == name_attr.empty()) 
     && (true == physical_name_attr.empty()) ) {
-    pb_type_annotation.set_physical_pb_type_name(name_attr);
+    openfpga::PbParser physical_pb_parser(name_attr);
+    pb_type_annotation.set_physical_pb_type_name(physical_pb_parser.leaf());
+    if (0 < physical_pb_parser.parents().size()) {
+      pb_type_annotation.set_physical_parent_pb_type_names(physical_pb_parser.parents());
+    }
+    if (0 < physical_pb_parser.modes().size()) {
+      pb_type_annotation.set_physical_parent_mode_names(physical_pb_parser.modes());
+    }
   }
 
   /* Parse physical mode name which are applied to both pb_types */
diff --git a/libopenfpga/libopenfpgautil/src/openfpga_pb_parser.cpp b/libopenfpga/libopenfpgautil/src/openfpga_pb_parser.cpp
new file mode 100644
index 000000000..ee674b928
--- /dev/null
+++ b/libopenfpga/libopenfpgautil/src/openfpga_pb_parser.cpp
@@ -0,0 +1,117 @@
+/************************************************************************
+ * Member functions for Pb parsers
+ ***********************************************************************/
+#include <cstring>
+
+#include "vtr_assert.h"
+
+#include "openfpga_tokenizer.h"
+
+#include "openfpga_pb_parser.h"
+
+/* namespace openfpga begins */
+namespace openfpga {
+
+/************************************************************************
+ * Member functions for PbParser class 
+ ***********************************************************************/
+
+/************************************************************************
+ * Constructors
+ ***********************************************************************/
+PbParser::PbParser (const std::string& data) {
+  set_default_bracket();
+  set_default_delim();
+  set_data(data);
+}
+
+/************************************************************************
+ * Public Accessors
+ ***********************************************************************/
+/* Get the data string */
+std::string PbParser::data() const {
+  return data_;
+}
+
+std::string PbParser::leaf() const {
+  return leaf_;
+}
+
+std::vector<std::string> PbParser::parents() const {
+  return parents_;
+}
+
+std::vector<std::string> PbParser::modes() const {
+  return modes_;
+}
+
+/************************************************************************
+ * Public Mutators
+ ***********************************************************************/
+void PbParser::set_data(const std::string& data) {
+  data_ = data;
+  parse();
+}
+
+/************************************************************************
+ * Internal Mutators
+ ***********************************************************************/
+/* Parse the data */
+void PbParser::parse() {
+  /* Create a tokenizer */
+  StringToken tokenizer(data_);
+
+  /* Split the data into <pb_type>[<mode>] */
+  std::vector<std::string> pb_tokens = tokenizer.split(delim_);
+
+  /* The last pb is the leaf node.
+   * It should NOT be empty and should NOT contain any brackets!  
+   */
+  VTR_ASSERT(false == pb_tokens.back().empty());
+  VTR_ASSERT(pb_tokens.back().find(bracket_.x()) == std::string::npos);
+  VTR_ASSERT(pb_tokens.back().find(bracket_.y()) == std::string::npos);
+  /* Pass the check, we assign the value */
+  leaf_ = pb_tokens.back();
+
+  /* Split the rest of pb_tokens, split the pb_type and mode_name */
+  for (size_t itok = 0; itok < pb_tokens.size() - 1; ++itok) {
+    /* Create a tokenizer */
+    StringToken pb_tokenizer(pb_tokens[itok]);
+    std::vector<std::string> tokens = pb_tokenizer.split(bracket_.x());
+    /* Make sure we have a port name! */
+    VTR_ASSERT_SAFE ((1 == tokens.size()) || (2 == tokens.size()));
+    /* Store the pb_type name */
+    parents_.push_back(tokens[0]);
+
+    /* If we only have one token, the mode name is the default mode
+     * Here we use the default keyword 'default'
+     * from VPR function ProcessMode() in libarchfpga
+     */
+    if (1 == tokens.size()) {
+      modes_.push_back(std::string("default"));
+      continue; /* We can finish here */
+    }
+   
+    /* If there is a mode name, extract it */
+    VTR_ASSERT_SAFE (2 == tokens.size());
+
+    /* Chomp the ']' */
+    pb_tokenizer.set_data(tokens[1]);
+    std::vector<std::string> mode_tokens = pb_tokenizer.split(bracket_.y());
+
+    /* Make sure we have only one mode name inside */
+    VTR_ASSERT(1 == mode_tokens.size());
+    modes_.push_back(mode_tokens[0]);
+  }
+}
+
+void PbParser::set_default_bracket() {
+  bracket_.set_x('[');
+  bracket_.set_y(']');
+}
+
+void PbParser::set_default_delim() {
+  delim_ = '.';
+}
+
+} /* namespace openfpga ends */
diff --git a/libopenfpga/libopenfpgautil/src/openfpga_pb_parser.h b/libopenfpga/libopenfpgautil/src/openfpga_pb_parser.h
new file mode 100644
index 000000000..d59286136
--- /dev/null
+++ b/libopenfpga/libopenfpgautil/src/openfpga_pb_parser.h
@@ -0,0 +1,56 @@
+#ifndef OPENFPGA_PB_PARSER_H
+#define OPENFPGA_PB_PARSER_H
+
+/********************************************************************
+ * Include header files that are required by data structure declaration
+ *******************************************************************/
+#include <string>
+#include <vector>
+
+#include "vtr_geometry.h"
+
+#include "openfpga_tokenizer.h"
+
+/************************************************************************
+ * This file includes parsers for pb_type definition in the architecture XML
+ * language.
+ ***********************************************************************/
+
+/* namespace openfpga begins */
+namespace openfpga {
+
+/************************************************************************
+ * Class PbParser: pb_type name with full hierarchy parser
+ * Supported pb_type definition:
+ *   1. <pb_type>[<mode>].<sub_pb_type>[<mode>] ... .<leaf_pb_type>
+ *   2. <pb_type>.<sub_pb_type> ... .<leaf_pb_type>
+ * where each pb_type may be specified by a mode or use the default mode
+ * (mode name not given) 
+ ***********************************************************************/
+class PbParser{
+  public : /* Constructors*/
+    PbParser (const std::string& data);
+  public : /* Public Accessors */ 
+    std::string data() const;
+    std::string leaf() const;
+    std::vector<std::string> parents() const;
+    std::vector<std::string> modes() const;
+  public : /* Public Mutators */ 
+    void set_data(const std::string& data);
+  private : /* Private Mutators */ 
+    void parse();
+    void set_default_bracket();
+    void set_default_delim();
+  private: /* Internal data */
+    std::string data_; /* Lines to be splited */
+    vtr::Point<char> bracket_;
+    char delim_;
+    std::vector<std::string> parents_;
+    std::vector<std::string> modes_;
+    std::string leaf_;
+};
+
+} /* namespace openfpga ends */
+
+#endif
+