Sample impact function format proposal as per https://github.com/AIFDR/inasafe/issues/587

inasafe-impact-function-format

<?xml version="1.0" encoding="UTF-8"?>
<Record
   xmlns="http://www.opengis.net/cat/csw/2.0.2" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:ows="http://www.opengis.net/ows" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/record.xsd">
   <dc:identifier>123</dc:identifier>
   <dc:title>My Impact function calculation</dc:title>
   <dct:modified>2013-07-23T11:01:41Z</dct:modified>
   <dct:abstract>This is my impact function description</dct:abstract>
   <dc:type>model</dc:type>
   <dc:subject>impact</dc:subject>
   <dc:subject>function</dc:subject>
   <dc:subject>disaster</dc:subject>
   <dc:format>XML+JSON</dc:format>
   <dc:creator>ACME, inc.</dc:creator>
   <dc:language>en</dc:language>
   <inasafe:impact_function><![CDATA[
   {
     version: x.y.z,
     document_type: 'impact_assessment',
     function_details: {
       ...
     }
     ...
   }
   ]]></inasafe:impact_function>
   <ows:WGS84BoundingBox>
      <ows:LowerCorner>miny minx</ows:LowerCorner>
      <ows:UpperCorner>maxy maxx</ows:UpperCorner>
   </ows:WGS84BoundingBox>
</Record>