Routines (alphabetical) > Routines: H > HDF5 Routines > H5T_SET_TAG

# H5T_SET_TAG

The H5T_SET_TAG procedure sets a tag string on an opaque data type.

## Syntax

H5T_SET_TAG, Datatype_id, Tag

## Arguments

### Datatype_id

A long integer containing the identifier of the opaque datatype.

### Tag

A string containing the new tag for the opaque datatype.

Note: Tag strings can contain a maximum of 255 characters.

## Keywords

None

## Version History

6.3 | Introduced

## See Also

H5T_GET_TAG, H5T_IDL_CREATE