tripal/tripal_ws/tripal_ws.module

<?php


/**
 * Implements hook_init()
 */
function tripal_ws_init() {
  global $base_url;

  $version = 'v0.1';
  $api_url = $base_url . '/ws/' . $version;

  // Following the WC3 Hydra documentation, we want to add  LINK to the header
  // of the site that indicates where the API documentation can be found.
  // This allows a hydra-enabled client to discover the API and use it.
  $attributes = array(
    'rel' => 'http://www.w3.org/ns/hydra/core#apiDocumentation',
    'href' => $api_url . '/ws-doc/',
  );
  drupal_add_html_head_link($attributes, $header = FALSE);
}

/**
 * Implements hook_menu().
 * Defines all menu items needed by Tripal Core
 *
 * @ingroup tripal_ws
 */
function tripal_ws_menu() {

  // Web Services API callbacks.
  $items['ws/v0.1'] = array(
    'title' => 'Tripal Entities Web Services API v0.1',
    'page callback' => 'tripal_ws_rest',
    'access arguments' => array('access content'),
    'file' => '/includes/tripal_ws.rest.inc',
    'type' => MENU_CALLBACK,
  );

  return $items;
}