Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE concept
PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-A0E75BD9-E3C6-5D28-B53C-B76260F63B89" xml:lang="en"><title> Persistent stores </title><prolog><metadata><keywords/></metadata></prolog><conbody/></concept>