Define Content types in Sharepoint 2010

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">

       <!-- Parent ContentType: Event (OPS Events\OPSEventsContentType) (0x01020040bc988755064919bdff99cafa3b38f4) -->

       <ContentType ID="0x01020040bc988755064919bdff99cafa3b38f4001421e28a5efd4635aa50cf2a4083bf51"

                            Name="CustomContentType"

                            Group="Custom Content Types"

                            Description="Test content Type"

                            Inherits="TRUE"

                            Version="0">

              <FieldRefs>
  <!--custom field -->

                     <FieldRef ID="{41063E43-A214-4434-8313-FC88C859CFA9}" Name="OPSWorkspaceLink" DisplayName="Workspace Link" ShowInNewForm="FALSE" />

                                         

                    

              </FieldRefs>

  <!--custom display/edit/new forms-->

              <XmlDocuments>

                     <XmlDocument NamespaceURI="http://schemas.microsoft.com/sharepoint/v3/contenttype/forms">

                           <FormTemplates xmlns="http://schemas.microsoft.com/sharepoint/v3/contenttype/forms">

                                  <Display>OPSCalendarForm</Display>

                                  <Edit>OPSCalendarForm</Edit>

                                  <New>OPSCalendarForm</New>

                           </FormTemplates>

                     </XmlDocument>

              </XmlDocuments>

       </ContentType>

</Elements>