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.