DAVFetchSpec
============

Required Context

  request-url => entity

DAV PROPFIND

  entity:
    Request URL

  scope:
    0         - object
    1         - collection children + collection
    1,noroot  - collection children
    infinity  - all children, deep

  attribute selection
    propnames  ([[obj soClass] -allKeysInContext:] ?)
    allprops   (= SQL SELECT * FROM...)

DAV SEARCH SQL
  
  entity:
    traversal of "xxx" -> [requesturl relativeURL:xxx]
    => only children allowed in FROM ?
  
  scope
    shallow (= depth 1 or 1,noroot ??)
      FROM Scope('shallow traversal of ""')
      FROM scope('shallow traversal of "http://x:23000/a/ol/helge/Contacts"')

    hierarchical (= depth infinity)    
      from scope('hierarchical traversal of "/janb/"')
  
  attribute selection
    named, fqn
      "DAV:creationdate", 
      "http://schemas.microsoft.com/mapi/email3addrtype", 
      "urn:schemas:contacts:cn"
    *


WHERE:
where "DAV:iscollection" = False and "DAV:ishidden" = False      order by "http://schemas.microsoft.com/mapi/proptag/x0e230003"