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<h3 class="sectionHead"><span class="titlemark">5.5   </span> <a 
 id="x21-1270005"></a>Layering</h3>
<a 
 id="x21-127001r166"></a>
<h4 class="subsectionHead"><span class="titlemark">5.5.1   </span> <a 
 id="x21-1280001"></a>Description</h4>
<!--l. 506--><p class="noindent" >In addition to the actor containment hierarchies, layering provides another method to hierarchically structure a
software system. Layering and actor hierarchies with port to port connections can be mixed on every level of
granularity.
     </p><ol  class="enumerate1" >
     <li 
  class="enumerate" id="x21-128002x1">an actor class can define a Service Provision Point (<span id="textcolor49"><span 
class="ec-lmssbx-10">SPP</span></span>) to publish a specific service, defined by a protocol
     class
     </li>
     <li 
  class="enumerate" id="x21-128004x2">an actor class can define a Service Access Point (<span id="textcolor50"><span 
class="ec-lmssbx-10">SAP</span></span>) if it needs a service, defined by a protocol class
     </li>
     <li 
  class="enumerate" id="x21-128006x3">for a given actor hierarchy, a <span id="textcolor51"><span 
class="ec-lmssbx-10">LayerConnection</span></span> defines which SAP will be satisfied by (connected to) which
     SPP</li></ol>
<a 
 id="x21-128007r168"></a>
<h4 class="subsectionHead"><span class="titlemark">5.5.2   </span> <a 
 id="x21-1290002"></a>Notation</h4>
<!--l. 521--><p class="noindent" >For the graphical and textual notation refer to table <a 
href="#x21-129001r5">5.5<!--tex4ht:ref: tab:layering_notation --></a>
</p>
<div class="table">
                                                                                            
                                                                                            
<!--l. 524--><p class="noindent" ><a 
 id="x21-129001r5"></a></p><hr class="float" /><div class="float" 
>
                                                                                            
                                                                                            
 <div class="caption" 
><span class="id">Table&#x00A0;5.5: </span><span  
class="content">Layering Notation</span></div><!--tex4ht:label?: x21-129001r5 -->
<div class="tabular"> <table id="TBL-14" class="tabular" 
cellspacing="0" cellpadding="0" rules="groups" 
><colgroup id="TBL-14-1g"><col 
id="TBL-14-1" /></colgroup><colgroup id="TBL-14-2g"><col 
id="TBL-14-2" /></colgroup><colgroup id="TBL-14-3g"><col 
id="TBL-14-3" /></colgroup><tr 
class="hline"><td><hr /></td><td><hr /></td><td><hr /></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-14-1-"><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-1-1"  
class="td11"> <!--l. 528--><p class="noindent" ><span 
class="ec-lmssbx-10">Description</span>           </p></td><td  style="white-space:nowrap; text-align:center;" id="TBL-14-1-2"  
class="td11"> <span 
class="ec-lmssbx-10">Graphical Notation  </span></td><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-1-3"  
class="td11"> <!--l. 528--><p class="noindent" ><span 
class="ec-lmssbx-10">Textual Notation</span>                                          </p></td>
</tr><tr 
class="hline"><td><hr /></td><td><hr /></td><td><hr /></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-14-2-"><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-2-1"  
class="td11">
 <div class="flushleft" 
>
 <!--l. 530--><p class="noindent" >
  The layer
  connections in this
  model define which
  services are provided
  by the <span 
class="ec-lmsso-10">ServiceLayer</span>
  (<span 
class="ec-lmsso-10">digitalIO </span>and
  <span 
class="ec-lmsso-10">timer</span>)</p></div>
  <!--l. 533--><p class="noindent" >                            </p></td><td  style="white-space:nowrap; text-align:center;" id="TBL-14-2-2"  
class="td11">        <img 
src="images/040-LayeringModel.png" alt="PIC"  
 />            </td><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-2-3"  
class="td11"> <!--l. 537-->
 <div class="lstlisting" id="listing-36"><span class="label"><a 
 id="x21-129002r1"></a></span><span 
class="ec-lmssbx-10x-x-90">ActorClass</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Mode1</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129003r2"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">Structure</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129004r3"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Services</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">ServiceLayer</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129005r4"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Application</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">ApplicationLayer</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129006r5"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">LayerConnection</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ref</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Application</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">satisfied_by</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Services</span><span 
class="ec-lmtt-9">.</span><span 
class="ec-lmtt-9">timer</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129007r6"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">LayerConnection</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ref</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Application</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">satisfied_by</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Services</span><span 
class="ec-lmtt-9">.</span><span 
class="ec-lmtt-9">digitalIO</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129008r7"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129009r8"></a></span><span 
class="ec-lmtt-9">}</span>
 
</div>
<!--l. 548--><p class="noindent" >                                                 </p></td>
</tr><tr 
class="hline"><td><hr /></td><td><hr /></td><td><hr /></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-14-3-"><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-3-1"  
class="td11">
 <div class="flushleft" 
>
 <!--l. 549--><p class="noindent" >
  The
  implementation of
  the services (SPPs)
  can be delegated to
  sub actors. In this
  case the actor
  <span 
class="ec-lmsso-10">ServiceLayer </span>relays
  (delegates) the
  implementation
  services <span 
class="ec-lmsso-10">digitalIO</span>
  and <span 
class="ec-lmsso-10">timer </span>to sub
  actors</p></div>
  <!--l. 553--><p class="noindent" >                            </p></td><td  style="white-space:nowrap; text-align:center;" id="TBL-14-3-2"  
class="td11">        <img 
src="images/040-LayeringServiceLayer.png" alt="PIC"  
 />            </td><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-3-3"  
class="td11"> <!--l. 556-->
 <div class="lstlisting" id="listing-37"><span class="label"><a 
 id="x21-129010r1"></a></span><span 
class="ec-lmssbx-10x-x-90">ActorClass</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">ServiceLayer</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129011r2"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">Interface</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129012r3"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">SPP</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">timer</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">TimerProtocol</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129013r4"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">SPP</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">digitalIO</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">DigitalIOProtocol</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129014r5"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129015r6"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">Structure</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129016r7"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Timer</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">TimerService</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129017r8"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">DigIO</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">DifitalIOService</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129018r9"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">LayerConnection</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">relay_sap</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">timer</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">satisfied_by</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">Timer</span><span 
class="ec-lmtt-9">.</span><span 
class="ec-lmtt-9">timer</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129019r10"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">LayerConnection</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">relay_sap</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">digitalIO</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">satisfied_by</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">DigIO</span><span 
class="ec-lmtt-9">.</span><span 
class="ec-lmtt-9">digitalIO</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129020r11"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129021r12"></a></span><span 
class="ec-lmtt-9">}</span>
 
</div>
<!--l. 571--><p class="noindent" >                                                 </p></td>
</tr><tr 
class="hline"><td><hr /></td><td><hr /></td><td><hr /></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-14-4-"><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-4-1"  
class="td11">
 <div class="flushleft" 
>
 <!--l. 572--><p class="noindent" >
  Every Actor inside
  the
  <span 
class="ec-lmsso-10">ApplicationLayer</span>
  that contains an
  SAP with the same
  protocol as <span 
class="ec-lmsso-10">timer </span>or
  <span 
class="ec-lmsso-10">digitalIO </span>will be
  connected to the
  specified SPP</p></div>
  <!--l. 575--><p class="noindent" >                            </p></td><td  style="white-space:nowrap; text-align:center;" id="TBL-14-4-2"  
class="td11">        <img 
src="images/040-LayeringApplicationLayer.png" alt="PIC"  
 />            </td><td  style="white-space:nowrap; text-align:left; vertical-align:middle;" id="TBL-14-4-3"  
class="td11"> <!--l. 578-->
 <div class="lstlisting" id="listing-38"><span class="label"><a 
 id="x21-129022r1"></a></span><span 
class="ec-lmssbx-10x-x-90">ActorClass</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">ApplicationLayer</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129023r2"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">Structure</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129024r3"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">function1</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">A</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129025r4"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">function2</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">B</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129026r5"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">function3</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">C</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129027r6"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">ActorRef</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">function4</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">D</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129028r7"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129029r8"></a></span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129030r9"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129031r10"></a></span><span 
class="ec-lmssbx-10x-x-90">ActorClass</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">A</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129032r11"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">Structure</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129033r12"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">SAP</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">timerSAP</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">TimerProtocol</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129034r13"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129035r14"></a></span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129036r15"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129037r16"></a></span><span 
class="ec-lmssbx-10x-x-90">ActorClass</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">B</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129038r17"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">Structure</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">{</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129039r18"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">SAP</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">timerSAP</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">TimerProtocol</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129040r19"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmssbx-10x-x-90">SAP</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">digitalSAP</span><span 
class="ec-lmtt-9">:</span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">DigitalIOProtocol</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129041r20"></a></span><span 
class="ec-lmtt-9">&#x00A0;</span><span 
class="ec-lmtt-9">}</span><span 
class="ec-lmtt-9">&#x00A0;</span><br /><span class="label"><a 
 id="x21-129042r21"></a></span><span 
class="ec-lmtt-9">}</span>
 
</div>
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