# HDF Reference Manual

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> ### AN - Multifile Annotation Interface

> | ANannlen/afannlen | Returns the length of an annotation.
> | ANannlist/afannlist | Retrieves the annotation identifiers of an object.
> | ANatype2tag/afatypetag | Returns the annotation tag corresponding to an annotation type.
> | ANcreate/afcreate | Creates a data annotation for an object.
> | ANcreatef/affcreate | Creates a file annotation.
> | ANend/afend | Terminates access to an AN interface.
> | ANendaccess/afendaccess | Terminates access to an annotation.
> | ANfileinfo/affileinfo | Retrieves the number of annotations of each type in a file.
> | ANget_tagref/afgettagref | Retrieves the tag/reference number pair of an annotation given its index and type.
> | ANid2tagref/afidtagref | Retrieves the tag/reference number pair of an annotation given its identifier.
> | ANnumann/afnumann | Returns the number of annotations of a given type attached to an object.
> | ANreadann/afreadann | Reads an annotation.
> | ANselect/afselect | Obtains an existing annotation.
> | ANstart/afstart | Initializes the AN interface.
> | ANtag2atype/aftagatype | Returns the annotation type corresponding to an annotation tag.
> | ANtagref2id/aftagrefid | Returns the identifier of an annotation given its tag/reference number pair.
> | ANwriteann/afwriteann | Writes an annotation.

> ###

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