title: Annotation (notes, comments) using Quartz 2d in ios
body: <p>I am doing PDF based application for iPad. It supports thumbnail view, Free hand comment, And annotations (Notes). Ya and I searched lot on net but I didnt find any relevant answer for making annotation on PDF using Quartz 2d. </p>
  
  <p>We can get PDF page info using<br>
  <code>CGPDFDictionaryRef CGPDFPageGetDictionary ( CGPDFPageRef page );</code><br>
  And using <code>Annots</code> key.<br>
  <code>bool CGPDFDictionaryGetArray ( CGPDFDictionaryRef dict, "Annots", CGPDFArrayRef *value );</code><br>
  you can get annotation for particular page. If I am right what is key for <strong>Notes</strong> and if it is there how to update page dictionary.<br>
  If i am wrong at all in above concern please let me know how <strong>Notes</strong> gets rendered on PDF. Or where PDF renderer gets info about <strong>Notes</strong>.?<br>
  Please let me know If any one knows ASAP. Really thanks in advance.</p>