# HDF Reference Manual

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> ### VSQ - Vdata Query Interface

> | VSQuerycount/vsqfnelt | Retrieves the number of records in a vdata.
> | VSQueryfields/vsqfflds | Retrieves the names of the fields in a vdata.
> | VSQueryinterlace/vsqfintr | Retrieves the interlace mode of the vdata.
> | VSQueryname/vsqfname | Retrieves the name of a vdata.
> | VSQueryref/vsqref | Returns the reference number of a vdata.
> | VSQuerytag/vsqtag | Returns the tag of the specified vdata.
> | VSQueryvsize/vsqfvsiz | Retrieves the size of a record in a vdata.

> ###

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