diff --git a/app/logical/post_query_builder.rb b/app/logical/post_query_builder.rb
index ec2a85961..209fa8506 100644
--- a/app/logical/post_query_builder.rb
+++ b/app/logical/post_query_builder.rb
@@ -34,6 +34,9 @@ class PostQueryBuilder
 
     when :lte
       relation.where(["#{field} <= ?", arr[1]])
+      
+    when :in
+      relation.where(["#{field} in (?)", arr[1]])
 
     when :between
       relation.where(["#{field} BETWEEN ? AND ?", arr[1], arr[2]])
diff --git a/app/models/pool.rb b/app/models/pool.rb
index 584f017f5..eb65548cd 100644
--- a/app/models/pool.rb
+++ b/app/models/pool.rb
@@ -114,6 +114,10 @@ class Pool < ActiveRecord::Base
     name.tr("_", " ")
   end
   
+  def creator_name
+    User.id_to_name(creator_id)
+  end
+  
   def normalize_post_ids
     self.post_ids = self.class.normalize_post_ids(post_ids)
   end
@@ -237,4 +241,27 @@ class Pool < ActiveRecord::Base
     @neighbor_posts = nil
     clear_post_id_array
   end
+  
+  def to_xml(options = {}, &block)
+    # to_xml ignores the serializable_hash method
+    options ||= {}
+    options[:methods] = [:creator_name]
+    super(options, &block)
+  end
+  
+  def serializable_hash(options = {})
+    return {
+      "created_at" => created_at,
+      "creator_id" => creator_id,
+      "creator_name" => creator_name,
+      "description" => description,
+      "id" => id,
+      "is_active" => is_active?,
+      "is_deleted" => is_deleted?,
+      "name" => name,
+      "post_count" => post_count,
+      "post_ids" => post_ids,
+      "updated_at" => updated_at
+    }
+  end
 end
diff --git a/app/models/post.rb b/app/models/post.rb
index fc2f2afcd..2bf7b319e 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -817,6 +817,7 @@ class Post < ActiveRecord::Base
     def to_xml(options = {}, &block)
       # to_xml ignores the serializable_hash method
       options ||= {}
+      options[:methods] = [:uploader_name]
       options[:except] ||= []
       options[:except] += hidden_attributes
       super(options, &block)
diff --git a/app/models/tag.rb b/app/models/tag.rb
index d5f845d94..374e3d08d 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -199,6 +199,9 @@ class Tag < ActiveRecord::Base
 
       when /\A>(.+)/
         return [:gt, parse_cast($1, type)]
+        
+      when /,/
+        return [:in, range.split(/,/)]
 
       else
         return [:eq, parse_cast(range, type)]