Routines (alphabetical) > Routines: H > HDF Routines > HDF_AN_ID2TAGREF

# HDF_AN_ID2TAGREF

This function retrieves the HDF tag/reference number pair of the HDF AN annotation identified by its annotation identifier.

## Syntax

Result = HDF_AN_ID2TAGREF(Annotation_id, Annotation_tag, Annotation_ref)

## Return Value

Returns SUCCEED (0) if successful or FAIL (-1) otherwise.

## Arguments

### Annotation_id

HDF AN annotation identifier returned by HDF_AN_SELECT, HDF_AN_CREATE or HDF_AN_CREATEF.

### Annotation_tag

A named variable that will contain the HDF tag of the annotation. Possible values returned in Annotation_tag are:

- 104 = data label (DFTAG_DIL)
- 105 = data description (DFTAG_DIA)
- 100 = file label (DFTAG_FID)
- 101 = file description (DFTAG_FD)

### Annotation_ref

A named variable that will contain the HDF reference number of the annotation.

## Keywords

None

## Version History

5.2 | Introduced