How to: Extend docPointer ReadMe XML data

<?xml version="1.0" encoding="UTF-16"?>
<MapPage xmlns="http://www.docpointer.com/XMLSchema/MapPage20.xsd">
  <General>
    <Version>2.0</Version>
    <Description>Page Description</Description>
    <GUID>{0292EDC2-4570-4143-A833-7F78C14131C0}</GUID>
  </General>
  <Link>
    <ID>6</ID>
    <X>143</X>
    <Y>192</Y>
    <Width>128</Width>
    <Height>57</Height>
    <Address>http://www.docpointer.com/</Address>
    <Text>www.docpointer.com</Text>
    <Custom>
        <mydata>Hello World</mydata>
    </Custom>
  </Link>
  <Object>
    <ID>10</ID>
    <Type>0</Type>
    <X>70</X>
    <Y>314</Y>
    <Width>140</Width>
    <Height>42</Height>
    <Text>docPointer Web Site</Text>
    <BorderWidth>2</BorderWidth>
    <ObjBorderColor R="230" G="230" B="0" />
    <ObjBackColor R="255" G="255" B="0" />
    <ObjForeColor R="0" G="0" B="128" />
  </Object>
  <Line>
    <srcID>10</srcID>
    <dstID>6</dstID>
    <BorderWidth>2</BorderWidth>
    <BorderColor R="128" G="128" B="128" />
    <ArrowDst>1</ArrowDst>
  </Line>
</MapPage>