user37223: If I understand correctly using the Adafruit_Sensor one can extract information from the sensor specific information. These sensors are currently mentioned in the README. I am using the BNO055 for two things:

Orientation values (Heading, pitch, roll)
Linear Acceleration values

My code is similar to the Example mentioned Adafruit_BNO055's bunny
Code
I tried the following in my loop()
void loop() {
  // put your main code here, to run repeatedly:
  sensors_event_t event;
  bno.getEvent(&event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.x);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.y);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.z);
  Serial.println(F(""));

  Serial.print(F("Acceleration: "));
  Serial.print((float)event.acceleration.x);
  Serial.print(F(" "));
  Serial.print((float)event.acceleration.y);
  Serial.print(F(" "));
  Serial.print((float)event.acceleration.z);
  Serial.println(F(""));

  delay(BNO055_SAMPLERATE_DELAY_MS);
}

Created sensors_event_t event and used the orientation and acceleration parameters to obtain the orientation and acceleration values in x, y, z directions.
output
The orientation and accleration values are the same:
Orientation: 105.50 -20.56 -101.00
Acceleration: 105.50 -20.56 -101.00
Orientation: 97.81 -14.69 -119.56
Acceleration: 97.81 -14.69 -119.56
Orientation: 93.81 -10.94 -125.56
Acceleration: 93.81 -10.94 -125.56
Orientation: 94.44 -12.25 -122.56

I tried adding another event event1 in the loop() but I still get the same results
sensors_event_t event;
  bno.getEvent(&event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.x);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.y);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.z);
  Serial.println(F(""));

  sensors_event_t event1;
  bno.getEvent(&event1);
  Serial.print(F("Acceleration: "));
  Serial.print((float)event1.acceleration.x);
  Serial.print(F(" "));
  Serial.print((float)event1.acceleration.y);
  Serial.print(F(" "));
  Serial.print((float)event1.acceleration.z);
  Serial.println(F(""));

  delay(BNO055_SAMPLERATE_DELAY_MS);

Can't the BNO055 along with the Adafruit_Sensor library not provide the acceleration and orientation values as events or is the library used only to obtain orientation values from the BNO055?

user37223: Findings
If I use the same sensors_event_t in the code and use event.acceleration and event.orientation within the loop() and they provide me exactly the same values. I in fact get the same values for heading, pitch, roll and acceleration in x, y, z direction.
sensors_event_t event;
  bno.getEvent(&event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.heading);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.pitch);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.roll);
  Serial.println(F(""));
 Serial.print((float)event.acceleration.x); // same as roll
 Serial.println(F(""));
 Serial.print((float)event.acceleration.y); // same as pitch
 Serial.println(F(""));
 Serial.print((float)event.acceleration.z); // same as heading
 Serial.println(F(""));

Sensor
I have a Blue Dot BNO055 sensor and it has marking on it for X, Y, Z directions as follows:

I crossed checked with the logic of Euler Angles from Wikipedia
If i rotate along the x Axis, I do in fact get roll (0 to 360) and so on. 
Inference
The Adafruit_Sensor library provides only orientation values when used with BNO055 and Linear acceleration values need to be called separately using the Adafruit_BNO055.
code for Linear Acceleration and orientation
  sensors_event_t event;
  bno.getEvent(&event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.heading);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.pitch);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.roll);
  Serial.println(F(""));
//  Serial.print((float)event.acceleration.x); // same as roll
//  Serial.println(F(""));
//  Serial.print((float)event.acceleration.y); // same as pitch
//  Serial.println(F(""));
//  Serial.print((float)event.acceleration.z); // same as heading
//  Serial.println(F(""));

  imu::Vector<3> li_ac = bno.getVector(Adafruit_BNO055::VECTOR_ACCELEROMETER);
  Serial.print(F("Li. Acc.: "));
  Serial.print((float)li_ac.x());
  Serial.print(F(" "));

  Serial.print((float)li_ac.y());
  Serial.print(F(" "));

  Serial.print((float)li_ac.z());
  Serial.print(F(" "));
  Serial.println();

  delay(BNO055_SAMPLERATE_DELAY_MS);


37223: <p>If I understand correctly using the <a href="https://github.com/adafruit/Adafruit_Sensor" rel="nofollow noreferrer"><code>Adafruit_Sensor</code></a> one can extract information from the sensor specific information. These sensors are currently mentioned in the <code>README</code>. I am using the BNO055 for two things:</p>

<ol>
<li>Orientation values (Heading, pitch, roll)</li>
<li>Linear Acceleration values</li>
</ol>

<p>My code is similar to the Example mentioned <a href="https://github.com/adafruit/Adafruit_BNO055/blob/master/examples/bunny/bunny.ino" rel="nofollow noreferrer">Adafruit_BNO055's bunny</a></p>

<h3>Code</h3>

<p>I tried the following in my <code>loop()</code></p>



<pre class="lang-cpp prettyprint-override"><code>void loop() {
  // put your main code here, to run repeatedly:
  sensors_event_t event;
  bno.getEvent(&amp;event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.x);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.y);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.z);
  Serial.println(F(""));

  Serial.print(F("Acceleration: "));
  Serial.print((float)event.acceleration.x);
  Serial.print(F(" "));
  Serial.print((float)event.acceleration.y);
  Serial.print(F(" "));
  Serial.print((float)event.acceleration.z);
  Serial.println(F(""));

  delay(BNO055_SAMPLERATE_DELAY_MS);
}
</code></pre>

<p>Created <code>sensors_event_t event</code> and used the <code>orientation</code> and <code>acceleration</code> parameters to obtain the orientation and acceleration values in x, y, z directions.</p>

<h3>output</h3>

<p>The orientation and accleration values are the same:</p>

<pre class="lang-cpp prettyprint-override"><code>Orientation: 105.50 -20.56 -101.00
Acceleration: 105.50 -20.56 -101.00
Orientation: 97.81 -14.69 -119.56
Acceleration: 97.81 -14.69 -119.56
Orientation: 93.81 -10.94 -125.56
Acceleration: 93.81 -10.94 -125.56
Orientation: 94.44 -12.25 -122.56
</code></pre>

<p>I tried adding another event <code>event1</code> in the <code>loop()</code> but I still get the same results</p>

<pre class="lang-cpp prettyprint-override"><code>sensors_event_t event;
  bno.getEvent(&amp;event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.x);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.y);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.z);
  Serial.println(F(""));

  sensors_event_t event1;
  bno.getEvent(&amp;event1);
  Serial.print(F("Acceleration: "));
  Serial.print((float)event1.acceleration.x);
  Serial.print(F(" "));
  Serial.print((float)event1.acceleration.y);
  Serial.print(F(" "));
  Serial.print((float)event1.acceleration.z);
  Serial.println(F(""));

  delay(BNO055_SAMPLERATE_DELAY_MS);
</code></pre>

<p>Can't the BNO055 along with the Adafruit_Sensor library not provide the acceleration and orientation values as events or is the library used only to obtain orientation values from the BNO055?</p>
 37223: <h2>Findings</h2>

<p>If I use the same <code>sensors_event_t</code> in the code and use <code>event.acceleration</code> and <code>event.orientation</code> within the <code>loop()</code> and they provide me exactly the same values. I in fact get the same values for heading, pitch, roll and acceleration in x, y, z direction.</p>

<pre><code>sensors_event_t event;
  bno.getEvent(&amp;event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.heading);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.pitch);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.roll);
  Serial.println(F(""));
 Serial.print((float)event.acceleration.x); // same as roll
 Serial.println(F(""));
 Serial.print((float)event.acceleration.y); // same as pitch
 Serial.println(F(""));
 Serial.print((float)event.acceleration.z); // same as heading
 Serial.println(F(""));
</code></pre>

<h2>Sensor</h2>

<p>I have a <strong>Blue Dot</strong> BNO055 sensor and it has marking on it for X, Y, Z directions as follows:
<a href="https://i.stack.imgur.com/OK9Qq.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OK9Qq.jpg" alt="Orientation on Sensor"></a></p>

<p>I crossed checked with the logic of <a href="https://en.wikipedia.org/wiki/Euler_angles#/media/File:Yaw_Axis_Corrected.svg" rel="nofollow noreferrer">Euler Angles from Wikipedia</a></p>

<p>If i rotate along the x Axis, I do in fact get roll (0 to 360) and so on. </p>

<h2>Inference</h2>

<p>The <code>Adafruit_Sensor</code> library provides only orientation values when used with BNO055 and Linear acceleration values need to be called separately using the <strong>Adafruit_BNO055</strong>.</p>

<h3>code for Linear Acceleration and orientation</h3>

<pre><code>  sensors_event_t event;
  bno.getEvent(&amp;event);

  Serial.print(F("Orientation: "));
  Serial.print((float)event.orientation.heading);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.pitch);
  Serial.print(F(" "));
  Serial.print((float)event.orientation.roll);
  Serial.println(F(""));
//  Serial.print((float)event.acceleration.x); // same as roll
//  Serial.println(F(""));
//  Serial.print((float)event.acceleration.y); // same as pitch
//  Serial.println(F(""));
//  Serial.print((float)event.acceleration.z); // same as heading
//  Serial.println(F(""));

  imu::Vector&lt;3&gt; li_ac = bno.getVector(Adafruit_BNO055::VECTOR_ACCELEROMETER);
  Serial.print(F("Li. Acc.: "));
  Serial.print((float)li_ac.x());
  Serial.print(F(" "));

  Serial.print((float)li_ac.y());
  Serial.print(F(" "));

  Serial.print((float)li_ac.z());
  Serial.print(F(" "));
  Serial.println();

  delay(BNO055_SAMPLERATE_DELAY_MS);
</code></pre>
