diff --git a/headers/modsecurity/transaction/collection.h b/headers/modsecurity/transaction/collection.h
new file mode 100644
index 00000000..069f1940
--- /dev/null
+++ b/headers/modsecurity/transaction/collection.h
@@ -0,0 +1,51 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+
+#ifndef HEADERS_MODSECURITY_TRANSACTION_COLLECTION_H_
+#define HEADERS_MODSECURITY_TRANSACTION_COLLECTION_H_
+
+
+#ifndef __cplusplus
+typedef struct Collection_t Collection;
+#endif
+
+
+#ifdef __cplusplus
+namespace ModSecurity {
+
+class Collection : public transaction::Variables {
+ public:
+     Collection(std::string name, std::string key)
+       : m_name(name),
+       m_key(key) { };
+
+     std::string m_name;
+     clock_t m_createTime;
+     bool m_persisted; /* IS_NEW from the old documentation */
+     std::string m_key;
+     clock_t m_lastUpdateTime;
+     double m_timeout;
+     double m_updateCounter;
+     double m_updateRate;
+};
+
+}  // namespace ModSecurity
+#endif
+
+
+#endif  // HEADERS_MODSECURITY_TRANSACTION_COLLECTION_H_
+
+
diff --git a/headers/modsecurity/transaction/collections.h b/headers/modsecurity/transaction/collections.h
index 02119ed9..95573884 100644
--- a/headers/modsecurity/transaction/collections.h
+++ b/headers/modsecurity/transaction/collections.h
@@ -29,6 +29,7 @@
 
 #include "modsecurity/transaction/variables.h"
 #include "modsecurity/transaction/variable.h"
+#include "modsecurity/transaction/collection.h"
 
 #ifndef HEADERS_MODSECURITY_TRANSACTION_COLLECTIONS_H_
 #define HEADERS_MODSECURITY_TRANSACTION_COLLECTIONS_H_
@@ -42,11 +43,12 @@ namespace ModSecurity {
 namespace transaction {
 
 class Collections :
-    public std::unordered_map<std::string, transaction::Variables *> {
+    public std::unordered_map<std::string, Collection *> {
  public:
     Collections();
     ~Collections();
 
+    void init(const std::string& name, const std::string& key);
     void store(std::string key, std::string value);
     void storeOrUpdateFirst(const std::string& collectionName,
         const std::string& variableName,
@@ -62,7 +64,6 @@ class Collections :
         std::list<transaction::Variable *> *l);
     std::list<transaction::Variable *> *resolve(const std::string& var);
 
-
     /**
      * This is a special collection to host the transaction variables.
      *
diff --git a/src/collections.cc b/src/collections.cc
new file mode 100644
index 00000000..2528ec2d
--- /dev/null
+++ b/src/collections.cc
@@ -0,0 +1,145 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+
+#include "modsecurity/transaction/collections.h"
+
+#ifdef __cplusplus
+#include <string>
+#include <iostream>
+#include <unordered_map>
+#include <list>
+#endif
+
+#include "modsecurity/transaction/variable.h"
+#include "src/utils.h"
+
+namespace ModSecurity {
+namespace transaction {
+
+
+Collections::Collections() {
+    /* Create collection TX */
+    this->emplace("TX", new Collection("TX", ""));
+}
+
+
+Collections::~Collections() { }
+
+
+void Collections::init(const std::string& name, const std::string& key) {
+    this->emplace(name, new Collection(name, key));
+}
+
+
+void Collections::storeOrUpdateFirst(const std::string& collectionName,
+    const std::string& variableName,
+    const std::string& targetValue) {
+    try {
+        transaction::Variables *collection;
+        collection = this->at(collectionName);
+        collection->storeOrUpdateFirst(collectionName + ":"
+            + variableName, targetValue);
+    } catch (...) {
+#if 0
+        debug(9, "don't know any collection named: "
+            + collectionName + ". it was created?");
+#endif
+    }
+}
+
+
+void Collections::store(std::string key, std::string value) {
+    m_transient.store(key, value);
+}
+
+
+bool Collections::storeOrUpdateFirst(const std::string &key,
+    const std::string &value) {
+    return m_transient.storeOrUpdateFirst(key, value);
+}
+
+
+bool Collections::updateFirst(const std::string &key,
+    const std::string &value) {
+    return m_transient.updateFirst(key, value);
+}
+
+
+void Collections::del(const std::string& key) {
+    return m_transient.del(key);
+}
+
+
+std::string* Collections::resolveFirst(const std::string& var) {
+    std::string *transientVar = m_transient.resolveFirst(var);
+
+    if (transientVar != NULL) {
+        return transientVar;
+    }
+
+    for (auto &a : *this) {
+        auto range = a.second->equal_range(var);
+        for (auto it = range.first; it != range.second; ++it) {
+            return &it->second;
+        }
+    }
+
+    return NULL;
+}
+
+
+std::string* Collections::resolveFirst(const std::string& collectionName,
+        const std::string& var) {
+        for (auto &a : *this) {
+            if (tolower(a.first) == tolower(collectionName)) {
+                transaction::Variables *t = a.second;
+                auto range = t->equal_range(toupper(collectionName)
+                    + ":" + var);
+                for (auto it = range.first; it != range.second; ++it) {
+                    return &it->second;
+                }
+            }
+        }
+
+        return NULL;
+    }
+
+
+void Collections::resolve(const std::string& var,
+    std::list<transaction::Variable *> *l) {
+
+    m_transient.resolve(var, l);
+
+    /* It may be a collection */
+    for (auto &a : *this) {
+        transaction::Variables *t = a.second;
+        a.second->resolve(var, l);
+    }
+}
+
+
+std::list<transaction::Variable *> *
+    Collections::resolve(const std::string& var) {
+    std::list<transaction::Variable *> *l =
+        new std::list<transaction::Variable *>();
+
+    resolve(var, l);
+
+    return l;
+}
+
+}  // namespace transaction
+}  // namespace ModSecurity