This datatype represents the set of uploadable attachment identifiers
for all files which can be attached to a particular resource description
via the Forum Nokia metadata editor.
This datatype is intended to be used as the rdfs:range of a property.
The property value will correspond to either a local filename identifier
of the attachment (without any path information) or to an http:// URI via
which the attachment can be accessed.
Properties which are specified with an rdfs:range of this datatype will
recieve special treatment by the metadata editor, such that a file upload
widget will be provided to the user for selecting and uploading the attachment
from their local filesystem. Upon successful upload, the local filename of
the uploaded attachment (without path information) will be stored as the
property value. The editor provides a retrieval servlet by which an attachment
can be retrieved by specifying the URI of the resource to which it is attached
and the filename of the attachment.
Upon publication of a metadata description containing attachment values, the
local filename value will be mapped to the full URI via which the attachment
can be accessed.
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