diff --git a/Rakefile b/Rakefile
index b1b3feb28..51a15e183 100644
--- a/Rakefile
+++ b/Rakefile
@@ -302,42 +302,56 @@ task :regress do
 end
 
 desc <<~DESC
-  Generate all certificates and profile PDFs.
+  Generate all portfolio-based PDFs (certificates and profiles).
 DESC
-task :cert_profile_pdfs do
+task :portfolio_pdfs do
+  puts ""
   puts "==================================="
-  puts "cert_profile_pdfs: Generating MC100"
-  puts "                   1st target"
+  puts "Generating MC100"
   puts "==================================="
+  puts ""
   Rake::Task["#{$root}/gen/certificate_doc/pdf/MC100.pdf"].invoke
 
+  puts ""
   puts "=================================================="
-  puts "cert_profile_pdfs: Generating MockCertificateModel"
-  puts "                   2nd target"
+  puts "Generating MockCertificateModel"
   puts "=================================================="
+  puts ""
   Rake::Task["#{$root}/gen/certificate_doc/pdf/MockCertificateModel.pdf"].invoke
 
+  puts ""
   puts "==================================="
-  puts "cert_profile_pdfs: Generating RVA20"
-  puts "                   3rd target"
+  puts "Generating RVA20"
   puts "==================================="
+  puts ""
   Rake::Task["#{$root}/gen/profile_doc/pdf/RVA20.pdf"].invoke
 
+  puts ""
   puts "==================================="
-  puts "cert_profile_pdfs: Generating RVA22"
-  puts "                   4th target"
+  puts "Generating RVA22"
   puts "==================================="
+  puts ""
   Rake::Task["#{$root}/gen/profile_doc/pdf/RVA22.pdf"].invoke
 
+  puts ""
   puts "==================================="
-  puts "cert_profile_pdfs: Generating RVI20"
-  puts "                   5th target"
+  puts "Generating RVI20"
   puts "==================================="
+  puts ""
   Rake::Task["#{$root}/gen/profile_doc/pdf/RVI20.pdf"].invoke
 
+  puts ""
   puts "==================================="
-  puts "cert_profile_pdfs: Generating MockProfileRelease"
-  puts "                   6th target"
+  puts "Generating MockProfileRelease"
   puts "==================================="
+  puts ""
   Rake::Task["#{$root}/gen/profile_doc/pdf/MockProfileRelease.pdf"].invoke
-end
\ No newline at end of file
+end
+
+# Shortcut targets for building profiles and certificates.
+task MC100: "#{$root}/gen/certificate_doc/pdf/MC100.pdf"
+task MockCertificateModel: "#{$root}/gen/certificate_doc/pdf/MockCertificateModel.pdf"
+task RVI20: "#{$root}/gen/profile_doc/pdf/RVI20.pdf"
+task RVA20: "#{$root}/gen/profile_doc/pdf/RVA20.pdf"
+task RVA22: "#{$root}/gen/profile_doc/pdf/RVA22.pdf"
+task MockProfileRelease: "#{$root}/gen/profile_doc/pdf/MockProfileRelease.pdf"
\ No newline at end of file
diff --git a/arch/profile_release/MockProfileRelease.yaml b/arch/profile_release/MockProfileRelease.yaml
index 45104cdec..ca4a0f10c 100644
--- a/arch/profile_release/MockProfileRelease.yaml
+++ b/arch/profile_release/MockProfileRelease.yaml
@@ -68,6 +68,9 @@ MockProfileRelease:
             optional: transitory
           version: "~> 1.11"
           note: Made this a transitory option
+        MockExt:
+          presence: mandatory
+          version: "~> 0.9.9"
       extra_notes:
       - presence: mandatory
         text: |
diff --git a/backends/profile_doc/tasks.rake b/backends/profile_doc/tasks.rake
index 167ba087e..489cfd9aa 100644
--- a/backends/profile_doc/tasks.rake
+++ b/backends/profile_doc/tasks.rake
@@ -4,7 +4,7 @@ rule %r{#{$root}/gen/profile_doc/adoc/.*\.adoc} => proc { |tname|
   profile_release_name = Pathname.new(tname).basename(".adoc")
 
   [
-    "#{$root}/.stamps/arch-gen.stamp",
+    "#{$root}/.stamps/arch-gen-_64.stamp",
     __FILE__,
     "#{$root}/lib/arch_obj_models/profile.rb",
     "#{$root}/backends/profile_doc/templates/profile.adoc.erb"
diff --git a/backends/profile_doc/templates/profile.adoc.erb b/backends/profile_doc/templates/profile.adoc.erb
index 166ec08b7..cee0ec4b2 100644
--- a/backends/profile_doc/templates/profile.adoc.erb
+++ b/backends/profile_doc/templates/profile.adoc.erb
@@ -2,7 +2,7 @@
 :description: <%= profile_release.marketing_name %> Profile
 :revdate: <%= profile_release.ratification_date.nil? ? Date.today : profile_release.ratification_date %>
 
-// XXX - Figure out what we really want here - Change percent hash to percent equals.
+// TODO - Figure out what we really want here - Change percent hash to percent equals.
 // :revnumber: <%# profile_release.map(&:version).sort.last %>
 
 :revmark: "TODO: revmark"
@@ -311,6 +311,7 @@ optional profile extensions for a new profile might be prototyped as
 non-profile extensions on an earlier profile.
 
 // XXX - Need to create render() Ruby function.
+// See https://github.com/riscv-software-src/riscv-unified-db/issues/59
 // <%# render("#{$root}/backends/portfolio_doc/templates/family_intro.erb", portfolio_class: profile_class) %>
 
 == <%= profile_class.name %> Profile Class
@@ -344,21 +345,6 @@ Ratification date:: <%= profile_release.ratification_date %>
 --
 <% end # each profile_release -%>
 
-=== Extension Presence
-
-The <%= profile_class.marketing_name %> Profile Class references
-<%= profile_class.referenced_extensions.size %> extensions.
-
-.Status
-|===
-| Extension | <%= profile_class.profiles.map(&:marketing_name).join(" | ") -%>
-
-<% profile_class.referenced_extensions.sort_by(&:name).each do |ext| -%>
-| <%= ext.name %> | <%= profile_class.profiles.map { |profile| profile.extension_presence(ext.name) }.join(" | ") -%>
-<% end -%>
-
-|===
-
 == <%= profile_release.name %> Profile Release
 
 <%= profile_release.introduction %>
@@ -370,8 +356,8 @@ associated implementation-defined parameters across all its defined profiles.
 === <%= profile_release.name %> Description
 
 <%= profile_release.description %>
-
 <% end # unless -%>
+
 <% profile_release.profiles.each do |profile| -%>
 === <%= profile.marketing_name %> Profile
 
@@ -411,6 +397,41 @@ associated implementation-defined parameters.
 
 <% end # each profile -%>
 
+<<<
+[appendix]
+== Profile Comparisons
+
+=== Release Comparison
+
+The <%= profile_class.marketing_name %> Profile Class has <%= profile_class.profile_releases.size %> releases that
+reference a total of <%= profile_class.referenced_extensions.size %> extensions.
+
+.Extension Presence
+|===
+| Extension | <%= profile_class.profile_releases.map(&:marketing_name).join(" | ") %>
+
+<% profile_class.referenced_extensions.sort_by(&:name).each do |ext| -%>
+| <%= ext.name %> | <%= profile_class.profile_releases.map { |profile_release| profile_release.extension_presence(ext.name) }.join(" | ") %>
+<% end -%>
+|===
+
+=== Profile Comparison
+
+The <%= profile_release.marketing_name %> Profile Release has <%= profile_release.profiles.size %> profiles that
+reference a total of <%= profile_release.referenced_extensions.size %> extensions.
+
+[NOTE]
+Extensions present in a profile are also present in higher-privileged profiles in the same profile release.
+
+.Extension Presence
+|===
+| Extension | <%= profile_release.profiles.map(&:marketing_name).join(" | ") %>
+
+<% profile_release.referenced_extensions.sort_by(&:name).each do |ext| -%>
+| <%= ext.name %> | <%= profile_release.profiles.map { |profile| profile.extension_presence(ext.name) }.join(" | ") %>
+<% end -%>
+|===
+
 <<<
 [appendix]
 == Extension Details
@@ -420,12 +441,12 @@ associated implementation-defined parameters.
 === <%= ext.name %> Extension
 <%= ext.long_name %>
 
-.Status
+.Presence
 |===
 | Profile | v<%= ext.versions.map { |v| v.version }.join(" | v") %>
 
 <% profile_release.profiles.each do |profile| -%>
-| <%= profile.marketing_name %> | <%= profile.version_strongest_presence(ext.name, ext.versions).join(" | ") -%>
+| <%= profile.marketing_name %> | <%= profile.version_greatest_presence(ext.name, ext.versions).join(" | ") -%>
 <% end -%>
 
 |===
diff --git a/lib/arch_obj_models/extension.rb b/lib/arch_obj_models/extension.rb
index b40aff3c5..97671b44a 100644
--- a/lib/arch_obj_models/extension.rb
+++ b/lib/arch_obj_models/extension.rb
@@ -476,8 +476,8 @@ def initialize(data)
     end
   end
 
-  def mandatory? = (@presence == mandatory) 
-  def optional? = (@presence == optional)
+  def mandatory? = (@presence == "mandatory") 
+  def optional? = (@presence == "optional")
 
   # Class methods
   def self.mandatory = "mandatory"
@@ -522,6 +522,17 @@ def to_s
     @optional_type.nil? ? "#{presence}" : "#{presence} (#{optional_type})"
   end
 
+  def to_s_concise
+    "#{presence}"
+  end
+
+  #
+  # Overloaded comparison operators following these rules:
+  #   - "mandatory" is greater than "optional"
+  #   - optional_types all have same rank
+  #   - equals compares presence and then optional_type
+  #
+
   # @overload ==(other)
   #   @param other [String] A presence string
   #   @return [Boolean] whether or not this ExtensionPresence has the same presence (ignores optional_type)
@@ -539,6 +550,26 @@ def ==(other)
     end
   end
 
+  # @overload >(other)
+  #   @param other [ExtensionPresence] An extension presence object
+  #   @return [Boolean] Whether or not this ExtensionPresence is greater-than the other
+  def >(other) = (self.mandatory? && other.optional?)
+
+  # @overload >=(other)
+  #   @param other [ExtensionPresence] An extension presence object
+  #   @return [Boolean] Whether or not this ExtensionPresence is greater-than or equal to the other
+  def >=(other) = (self > other) || (self == other)
+
+  # @overload <(other)
+  #   @param other [ExtensionPresence] An extension presence object
+  #   @return [Boolean] Whether or not this ExtensionPresence is less-than the other
+  def <(other) = (self.optional? && other.mandatory?)
+
+  # @overload <=(other)
+  #   @param other [ExtensionPresence] An extension presence object
+  #   @return [Boolean] Whether or not this ExtensionPresence is less-than or equal to the other
+  def <=(other) = (self < other) || (self == other)
+
   # Sorts by presence, then by optional_type
   def <=>(other)
     raise ArgumentError, "ExtensionPresence is only comparable to other ExtensionPresence classes" unless other.is_a?(ExtensionPresence)
diff --git a/lib/arch_obj_models/portfolio.rb b/lib/arch_obj_models/portfolio.rb
index e378cdc01..7a2ad3a8b 100644
--- a/lib/arch_obj_models/portfolio.rb
+++ b/lib/arch_obj_models/portfolio.rb
@@ -61,35 +61,48 @@ def description = @data["description"]
   # @return [Gem::Version] Semantic version of the PortfolioInstance
   def version = Gem::Version.new(@data["version"])
 
+  # @return [ExtensionPresence] Given an extension +ext_name+, return the presence.
+  #                             If the extension name isn't found in the portfolio, return nil.
+  def extension_presence_obj(ext_name)
+    # Get extension information from YAML for passed in extension name.
+    ext_data = @data["extensions"][ext_name]
+
+    ext_data.nil? ? nil : ExtensionPresence.new(ext_data["presence"])
+  end
+
   # @return [String] Given an extension +ext_name+, return the presence as a string.
   #                  If the extension name isn't found in the portfolio, return "-".
   def extension_presence(ext_name)
-    # Get extension information from YAML for passed in extension name.
-    ext_data = @data["extensions"][ext_name]
+    ext_presence_obj = extension_presence_obj(ext_name)
 
-    ext_data.nil? ? "-" : ExtensionPresence.new(ext_data["presence"]).to_s
+    ext_presence_obj.nil? ? "-" : ext_presence_obj.to_s
   end
 
-  # Returns the strongest presence string for each of the specified versions.
+  # Returns the greatest presence string for each of the specified versions.
   # @param ext_name [String]
   # @param ext_versions [Array<ExtensionVersion>]
   # @return [Array<String>]
-  def version_strongest_presence(ext_name, ext_versions)
+  def version_greatest_presence(ext_name, ext_versions)
     presences = []
     
-    # See if any extension requirement in this profile lists this version as either mandatory or optional.
     ext_versions.map do |v|
-      mandatory = mandatory_ext_reqs.any? { |ext_req| ext_req.satisfied_by?(ext_name, v.version) }
-      optional = optional_ext_reqs.any? { |ext_req| ext_req.satisfied_by?(ext_name, v.version) }
-
-      # Just show strongest presence (mandatory stronger than optional).
-      if mandatory
-        presences << ExtensionPresence.mandatory
-      elsif optional
-        presences << ExtensionPresence.optional
-      else
-        presences << "-"
+      greatest_presence = nil
+
+      in_scope_ext_reqs.each do |ext_req|
+        if ext_req.satisfied_by?(ext_name, v.version)
+          presence = extension_presence_obj(ext_name)
+
+          unless presence.nil? 
+            if greatest_presence.nil?
+              greatest_presence = presence
+            elsif presence > greatest_presence
+              greatest_presence = presence
+            end
+          end
+        end
       end
+
+      presences << (greatest_presence.nil? ? "-" : greatest_presence.to_s_concise)
     end
 
     presences
@@ -194,7 +207,7 @@ def to_arch_def
     end
     arch_def_data["params"] = all_in_scope_ext_params.select(&:single_value?).map { |p| [p.name, p.value] }.to_h
 
-    # XXX Add list of prohibited_extensions
+    # TODO: Add list of prohibited_extensions
 
     file = Tempfile.new("archdef")
     file.write(YAML.safe_dump(arch_def_data, permitted_classes: [Date]))
diff --git a/lib/arch_obj_models/profile.rb b/lib/arch_obj_models/profile.rb
index 44d63f3b4..497a62317 100644
--- a/lib/arch_obj_models/profile.rb
+++ b/lib/arch_obj_models/profile.rb
@@ -126,6 +126,27 @@ def referenced_extensions
 
     @referenced_extensions
   end
+
+  # @return [String] Given an extension +ext_name+, return the presence as a string.
+  #                  Returns the greatest presence string across all profiles in the release.
+  #                  If the extension name isn't found in the release, return "-".
+  def extension_presence(ext_name)
+    greatest_presence = nil
+
+    profiles.each do |profile|
+      presence = profile.extension_presence_obj(ext_name)
+
+      unless presence.nil? 
+        if greatest_presence.nil?
+          greatest_presence = presence
+        elsif presence > greatest_presence
+          greatest_presence = presence
+        end
+      end
+    end
+
+    greatest_presence.nil? ? "-" : greatest_presence.to_s_concise
+  end
 end
 
 # Representation of a specific profile in a profile release.