Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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<!DOCTYPE concept
PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-3A2785D4-6185-50C3-8D7E-5D94CD2B7C98" xml:lang="en"><title>Render Stages</title><shortdesc>This section provides information about the render stage framework
in the ScreenPlay. This framework enables device creators to change the lower
layers of the rendering pipeline without changing the Window Server code. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<p> <b>Variant</b>: <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref>. <b>Target
audience</b>: Device creators. </p>
</conbody><related-links>
<link href="GUID-22093E74-EFE7-5642-93DE-1573E18F7C08.dita"><linktext>Window Server
Rendering Loop</linktext></link>
<link href="GUID-5D81D4E2-BE8B-58CE-A745-4F044DE2FB5F.dita"><linktext>Window Server
Plug-in Framework</linktext></link>
<link href="GUID-23E414B0-581B-5B6C-A449-8DA7AD8E1FA4.dita"><linktext>Window Server
Plugins Component Overview</linktext></link>
</related-links></concept>