diff --git a/src/drafter.coffee b/src/drafter.coffee
index 6b8e7bc..224951c 100644
--- a/src/drafter.coffee
+++ b/src/drafter.coffee
@@ -7,6 +7,9 @@ fs = require 'fs'
 #
 class Drafter
 
+  # List of data structures
+  @dataStructures: []
+
   # Default configuration
   @defaultConfig:
     requireBlueprintName: false # Treat missing API name as error
@@ -35,7 +38,55 @@ class Drafter
   # @param source [String] soruce API Bluerpint code
   # @param callback [(Error, ParseResult)]
   make: (source, callback) ->
-    protagonist.parse source, @config, callback
+    protagonist.parse source, @config, (error, result) =>
+      callback error if error
+
+      ruleList = []
+      rules = (require './rules/' + rule for rule in ruleList)
+
+      @dataStructures = []
+
+      @expandNode result.ast, rules, 'blueprint'
+      callback error, result
+
+  # Expand a certain node with the given rules
+  #
+  # @param node [Object] A node of API Blueprint
+  # @param rules [Array] List of rules to apply
+  # @param elementTye [String] The element type of the node
+  expandNode: (node, rules, elementType) ->
+    elementType ?= node.element
+
+    # On root node, Gather data structures first before applying rules to any of the children nodes
+    if elementType is 'blueprint'
+      for element in node.content
+
+        if element.element is 'category'
+          for subElement in element.content
+            @dataStructures.push subElement if subElement.element is 'dataStructure'
+
+      # Expand the gathered data structures
+      for rule in rules
+        rule.dataStructures.call @dataStructures if 'dataStructures' in rule
+
+    # Apply rules to the current node
+    for rule in rules
+      rule[elementType].call node, @dataStructures if elementType in rule
+
+    # Recursively do the same for children nodes
+    switch elementType
+      when 'resource'
+        @expandNode action, rules, 'action' for action in node.actions
+
+      when 'action'
+        @expandNode example, rules, 'transactionExample' for example in node.examples
+
+      when 'transactionExample'
+        @expandNode request, rules, 'payload' for request in node.requests
+        @expandNode response, rules, 'payload' for response in node.responses
+
+    if node.content and Array.isArray node.content
+      @expandNode element, rules for element in node.content
 
 module.exports = Drafter
 module.exports.options = options