Functions Provides:

The following public functions are available. There is an equivalent set of F77 routines with names formed by converting the C name to upper case and inserting an underscore after the initial ``NDG'' string (C and F77 versions are - for the most part - documented individually in separate prologues below):

• ndgCopyProv: Create a deep copy of a provenance structure.
• ndgBegpv: Begin an NDF provenance block.
• ndgCountProv: Return the number of ancestors in a provenance structure.
• ndgFormatProv: Format all the information in a provenance structure.
• ndgEndpv: End an NDF provenance block.
• ndgFreeProv: Free the resources used by a provenance structure.
• ndgGetProv: Get information about a specific ancestor.
• ndgHideProv: Hide a specific ancestor.
• ndgHltpv: Temporarily stop recording NDFs within a provenance block
• ndgIsHiddenProv: See if an ancestor is hidden.
• ndgModifyProv: Modify information stored for a specific ancestor.
• ndgPutProv: Add a new ancestor NDF into a provenance structure.
• ndgReadProv: Create a new provenance structure by reading a given NDF.
• ndgRemoveProv: Remove ancestors from a provenance structure.
• ndgRootProv: Identify root ancestors in a provenance structure.
• ndgUnhideProv: Ensure an ancestor is not hidden.
• ndgWriteProv: Writes a provenance structure out to an NDF.

Note, within a provenance block, it is possible to prevent selected NDFs receiving provenance by using ndgHltpv (NDG_HLTPV) to stop the recording of NDF names before the NDFs are accessed, and then calling ndgHltpv again afterwards to re-establish the recording of NDF names.