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diff --git a/axiom/include/axiom_processing_instruction.h b/axiom/include/axiom_processing_instruction.h
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+++ b/axiom/include/axiom_processing_instruction.h
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+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AXIOM_PI_H
+#define AXIOM_PI_H
+
+#include <axiom_node.h>
+#include <axiom_output.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /**
+     * @defgroup axiom_processing_instruction pocessing instruction
+     * @ingroup axiom_om
+     * @{
+     */
+
+    typedef struct axiom_processing_instruction
+                axiom_processing_instruction_t;
+
+    /**
+      * Creates a processing instruction 
+      * @param environment Environment. MUST NOT be NULL.
+      * @param parent parent of the element node to be created. Optional, can be NULL.
+      * @param target target of the processing instruction.cannot be NULL.
+      * @param value value of the processing instruction.cannot be NULL.
+      * @param node This is an out parameter. cannot be NULL.
+      *     Returns the node corresponding to the comment created.
+      *     Node type will be set to AXIOM_PROCESSING_INSTRUCTION
+      * @return a pointer tonewly created processing instruction struct 
+      */
+    AXIS2_EXTERN axiom_processing_instruction_t *AXIS2_CALL
+    axiom_processing_instruction_create(
+        const axutil_env_t * env,
+        axiom_node_t * parent,
+        const axis2_char_t * target,
+        const axis2_char_t * value,
+        axiom_node_t ** node);
+
+    /**
+     * Frees an instance of axiom_processing_instruction
+     * @param om_pi processing instruction to be freed.
+     * @param env Environment. MUST NOT be NULL, .
+     * @return satus of the op. AXIS2_SUCCESS on success else AXIS2_FAILURE
+     */
+    AXIS2_EXTERN void AXIS2_CALL
+    axiom_processing_instruction_free(
+        struct axiom_processing_instruction *om_pi,
+        const axutil_env_t * env);
+
+    /**
+     * Set processing instruction data
+     * @param om_pi
+     * @param env Environment. MUST NOT be NULL, .
+     * @param value 
+     */
+    AXIS2_EXTERN axis2_status_t AXIS2_CALL
+    axiom_processing_instruction_set_value(
+        struct axiom_processing_instruction *om_pi,
+        const axutil_env_t * env,
+        const axis2_char_t * value);
+
+    /**
+     * Set processing instruction target
+     * @param om_pi processing_instruction struct
+     * @param env environment, MUST NOT be NULL.
+     * @param target 
+     * @return status of the op AXIS2_SUCCESS on success,
+     *     AXIS2_FAILURE on error.
+     */
+    AXIS2_EXTERN axis2_status_t AXIS2_CALL
+    axiom_processing_instruction_set_target(
+        struct axiom_processing_instruction *om_pi,
+        const axutil_env_t * env,
+        const axis2_char_t * target);
+
+    /**
+     * Get PI target
+     * @param om_pi processing_instruction struct
+     * @param env Environment. MUST NOT be NULL, .
+     * @return target text , NULL on error or if target is null
+     */
+    AXIS2_EXTERN axis2_char_t *AXIS2_CALL
+    axiom_processing_instruction_get_target(
+        struct axiom_processing_instruction *om_pi,
+        const axutil_env_t * env);
+
+    /**
+     * Get data part of processing_instruction
+     * @param om_pi processing instruction 
+     * @param env environment , MUST NOT be NULL.
+     * @return data text , NULL if there is no data,
+     */
+    AXIS2_EXTERN axis2_char_t *AXIS2_CALL
+    axiom_processing_instruction_get_value(
+        struct axiom_processing_instruction *om_pi,
+        const axutil_env_t * env);
+
+    /**
+     * Serialize function
+     * @param om_pi processing_instruction struct
+     * @param env environment, MUST NOT be NULL.
+     * @param om_output om_output handler struct
+     * @return status of the op, AXIS2_SUCCESS on success,
+     *     AXIS2_FAILURE on error 
+     */
+    AXIS2_EXTERN axis2_status_t AXIS2_CALL
+    axiom_processing_instruction_serialize(
+        struct axiom_processing_instruction *om_pi,
+        const axutil_env_t * env,
+        axiom_output_t * om_output);
+
+    /** @} */
+#ifdef __cplusplus
+}
+#endif
+
+#endif                          /* AXIOM_PI_H */