Custom Metadata (XMP?)

[Jabulanison]

Hi

I want to create custom Metadata (to be associated with each image) for fields such as
Price
Dimensions of the painting
Artist
Art centre
etc.

I also want an easy way for people to add this information onto a form

AND I would like a way to fill some or all of these custom data fields through a bulk / batch process

Is there anything in XNView that can help me?

Would this Metadata be recognised by services like Zenfolio?

Many thanks