vann:preferredNamespacePrefix does not resolve. The vocabulary seems unmaintained. vann (https://purl.org/vocab/vann/) resolves, but only to HTML. This is an opportunity to suggest retiring vann and use instead MOD.
However, if we manage to find who maintains the purl.org for vann, we may be able to amend this.
existing term label
vann:preferredNamespacePrefix
replacement
mod:preferredNamespacePrefix
explanation
vann:preferredNamespacePrefix does not resolve. The vocabulary seems unmaintained. vann (https://purl.org/vocab/vann/) resolves, but only to HTML. This is an opportunity to suggest retiring vann and use instead MOD. However, if we manage to find who maintains the purl.org for vann, we may be able to amend this.
Btw, in MOD there is a typo: the id used for vann is https://vocab.org/vann/preferredNamespaceUri, which is incorrect.
additional information
This applies to all other vann properties.