Identifying C syntax - c

Question

So I was studying some tutorial code for a BLE implementation, and I came across this syntax which I have never seen before.
&p_ble_evt->evt.gatts_evt.params.write;
It is the &foo;bar-&baz part i'm unsure of.
I tried 'googleing' the code part, then tried running it through https://cdecl.org/.
But without getting an understanding for what this code does/is.
/**#brief Function for handling the Write event.
*
* #param[in] p_midi_service LED Button Service structure.
* #param[in] p_ble_evt Event received from the BLE stack.
*/
static void on_write(ble_midi_service_t * p_midi_service, ble_evt_t const * p_ble_evt)
{
ble_gatts_evt_write_t * p_evt_write = (ble_gatts_evt_write_t *) &p_ble_evt->evt.gatts_evt.params.write;
if ((p_evt_write->handle == p_midi_service->data_io_char_handles.value_handle) &&
(p_evt_write->len == 1) &&
(p_midi_service->evt_handler != NULL))
{
// Handle what happens on a write event to the characteristic value
}
// Check if the Custom value CCCD is written to and that the value is the appropriate length, i.e 2 bytes.
if ((p_evt_write->handle == p_midi_service->data_io_char_handles.cccd_handle)
&& (p_evt_write->len == 2)
)
{
// CCCD written, call application event handler
if (p_midi_service->evt_handler != NULL)
{
ble_midi_evt_t evt;
if (ble_srv_is_notification_enabled(p_evt_write->data))
{
evt.evt_type = BLE_DATA_IO_EVT_NOTIFICATION_ENABLED;
}
else
{
evt.evt_type = BLE_DATA_IO_EVT_NOTIFICATION_DISABLED;
}
p_midi_service->evt_handler(p_midi_service, &evt);
}
}
}
So if some kind soul would help enlighten me that would be much appreciated.
Thank you.

Answer 1

Looks like xml/html escape sequences, should read:
&p_ble_evt->evt.gatts_evt.params.write;