# HDF Reference Manual

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> ### V - Vgroup Interface

> | Vaddtagref/vfadtr | Inserts an object into a vgroup.
> | Vattach/vfatch | Initiates access to a new or existing vgroup.
> | Vattrinfo/vfainfo | Retrieves the name, data type, number of values, and value size of an attribute for a vgroup.
> | Vdelete/vdelete | Remove a vgroup from a file.
> | Vdeletetagref/vfdtr | Deletes an object from a vgroup.
> | Vdetach/vfdtch | Terminates access to a vgroup.
> | Vend/vfend | Terminates access to a vgroup and/or vdata interface.
> | Vfind/vfind | Returns the reference number of a vgroup given its name.
> | Vfindattr/vffdatt | Returns the index of a vgroup attribute given its name.
> | Vfindclass/vfndcls | Returns the reference number of a vgroup specified by its class name.
> | Vflocate/vffloc | Locates a vdata in a vgroup given a list of field names.
> | Vgetattr/vfgnatt/vfgcatt | Retrieves the values of a vgroup attribute.
> | Vgetclass/vfgcls | Retrieves the class name of a vgroup.
> | Vgetid/vfgid | Returns the reference number of the next vgroup.
> | Vgetname/vfgnam | Retrieves the name of a vgroup.
> | Vgetnext/vfgnxt | Gets the reference number of the next member (vgroup or vdata only) of a vgroup.
> | Vgettagref/vfgttr | Retrieves the tag/reference number pair of an object given its index within a vgroup.
> | Vgettagrefs/vfgttrs | Retrieves the tag/reference number pairs of the HDF objects belonging to a vgroup.
> | Vgetversion/vfgver | Gets the version of a vgroup.
> | Vinqtagref/vfinqtr | Checks whether an object belongs to a vgroup.
> | Vinquire/vfinq | Retrieves the number of entries in a vgroup and its name.
> | Vinsert/vfinsrt | Inserts a vdata or vgroup into a vgroup.
> | Visvg/vfisvg | Determines whether an element of a vgroup is a vgroup and a member of another vgroup.
> | Visvs/vfisvs | Determines whether a data object is a vdata within a vgroup.
> | Vlone/vflone | Retrieves the reference numbers of lone vgroups, i.e., vgroups that are at the top of the grouping hierarchy, in a file.
> | Vnattrs/vfnatts | Returns the number of attributes assigned to a vgroup.
> | Vnrefs/vnrefs | Returns the number of tags of a given tag type in a vgroup.
> | Vntagrefs/vfntr | Returns the number of objects in a vgroup.
> | Vsetattr/vfsnatt/vfscatt | Attaches an attribute to a vgroup.
> | Vsetclass/vfscls | Sets the class name of a vgroup.
> | Vsetname/vfsnam | Sets the name of a vgroup.
> | Vstart/vfstart | Initializes the vdata and/or vgroup interface.
> | VHmakegroup/vhfmkgp | Creates a vgroup.
> | VQueryref/vqref | Returns the reference number of a vgroup.
> | VQuerytag/vqtag | Returns the tag of a vgroup.

> ###

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