WP_REST_Controller::get_item_schema PHP Method

    public function get_item_schema()
    {
        return $this->add_additional_fields_schema(array());
    }

 /**
  * Retrieves the revision's schema, conforming to JSON Schema.
  *
  * @since 4.7.0
  * @access public
  *
  * @return array Item schema data.
  */
 public function get_item_schema()
 {
     $schema = array('$schema' => 'http://json-schema.org/schema#', 'title' => "{$this->parent_post_type}-revision", 'type' => 'object', 'properties' => array('author' => array('description' => __('The ID for the author of the object.'), 'type' => 'integer', 'context' => array('view', 'edit', 'embed')), 'date' => array('description' => __('The date the object was published.'), 'type' => 'string', 'format' => 'date-time', 'context' => array('view', 'edit', 'embed')), 'date_gmt' => array('description' => __('The date the object was published, as GMT.'), 'type' => 'string', 'format' => 'date-time', 'context' => array('view', 'edit')), 'guid' => array('description' => __('GUID for the object, as it exists in the database.'), 'type' => 'string', 'context' => array('view', 'edit')), 'id' => array('description' => __('Unique identifier for the object.'), 'type' => 'integer', 'context' => array('view', 'edit', 'embed')), 'modified' => array('description' => __('The date the object was last modified.'), 'type' => 'string', 'format' => 'date-time', 'context' => array('view', 'edit')), 'modified_gmt' => array('description' => __('The date the object was last modified, as GMT.'), 'type' => 'string', 'format' => 'date-time', 'context' => array('view', 'edit')), 'parent' => array('description' => __('The ID for the parent of the object.'), 'type' => 'integer', 'context' => array('view', 'edit', 'embed')), 'slug' => array('description' => __('An alphanumeric identifier for the object unique to its type.'), 'type' => 'string', 'context' => array('view', 'edit', 'embed'))));
     $parent_schema = $this->parent_controller->get_item_schema();
     if (!empty($parent_schema['properties']['title'])) {
         $schema['properties']['title'] = $parent_schema['properties']['title'];
     }
     if (!empty($parent_schema['properties']['content'])) {
         $schema['properties']['content'] = $parent_schema['properties']['content'];
     }
     if (!empty($parent_schema['properties']['excerpt'])) {
         $schema['properties']['excerpt'] = $parent_schema['properties']['excerpt'];
     }
     if (!empty($parent_schema['properties']['guid'])) {
         $schema['properties']['guid'] = $parent_schema['properties']['guid'];
     }
     return $this->add_additional_fields_schema($schema);
 }