This function checks out an object or a whole hierarchy of objects.
The parameters array contains the required element
'objectIdentifier' and the optional element 'version', 'mode'
and 'objectQuery'. 'mode' can be one of the following values:
HW_API_CHECKIN_NORMAL
Checks out an object. The object must be a document.
HW_API_CHECKIN_RECURSIVE
If the object to check out is a collection, all children will be
checked out recursively if they are documents. Trying to check out
a collection would result in an error.