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• column is optional, if not provided then the field will still appear, but an attempt to write the entered value into the underlying spatial table will not be made. The user entered value can still be used by other means that will be covered later.
• The controltype now supports 'textarea' which isn't available for search fields, it provides a multi-line text input field.
• readonly, readonlyoninsert and readonlyonupdate aren't available for search field either, they're special marker that allow you to alter the ability of the user to change the value in a field. These are client side flags, and if set alter the display of the field so that the user cannot change the value, the field is still displayed, just not editable.
• updatable specifies that one a value is set it can't be changed, this is similar to readonlyonupdate, and in fact readonlyonupdate will be set to true if updatable is set to false, but it also provides additional checks on the server to ensure that the value is not updated.
• value can be used to set a value explicitly by directly supplying the value, or there are a number of formulas that are available.
  • entity() The name of the entity type being edited.
  • userid() The current username.
  • ip() The current users IP address.
  • datetime() The current date/time.
  • operation() The type of operation being perform, will be one of the strings 'create', 'update' or 'delete'.
  • nextval() The value used for the column will be the previous largest value from the column plus one, the underlying column must be numeric.
  • geometry() A WKT (Well Known Text) representation of the geometry if available, otherwise null.
  • id() The value for the key field for the spatial table will be used if available, otherwise null.
  • auto() The value for the field is auto-generated by the database.
  • count() The number of geometry objects.
  • area() The area of the geometry.
  • length() The length of the geometry.

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