# HDF Reference Manual

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> ### DFAN - Single-file Annotation Interface

> | DFANaddfds/daafds | Adds a file description to a file.
> | DFANaddfid/daafid | Writes a file label to a file.
> | DFANclear/daclear | Resets all internal library structures and parameters of the DFAN annotation interface.
> | DFANgetdesc/dagdesc | Reads the description assigned to the data object with the given tag and reference number.
> | DFANgetdesclen/dagdlen | Retrieves the length of a description of the data object with the given tag and reference number.
> | DFANgetfds/dagfds | Reads the next file description.
> | DFANgetfdslen/dagfdsl | Returns the length of a file description.
> | DFANgetfid/dagfid | Reads a file label from a file.
> | DFANgetfidlen/dagfidl | Returns the length of a file label.
> | DFANgetlabel/daglab | Reads the label assigned to the data object identified by the given tag and reference number.
> | DFANgetlablen/dagllen | Returns the length of a label assigned to the object with a given tag and reference number.
> | DFANlablist/dallist | Returns a list of all reference numbers and labels (if labels exist) for a given tag.
> | DFANlastref/dalref | Returns the reference number of the annotation last written or read.
> | DFANputdesc/dapdesc | Writes a description for the data object with the given tag and reference number.
> | DFANputlabel/daplab | Assigns a label to the data object with the given tag/reference number pair.

> ###

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