[klodolph]

I think if you are using Dublin Core, it’s because you’re a library. Maybe I am off the mark, but that is the sense I get from this—not all these standards should be used for all pages on the web.

I think you should just think about what metadata you actually care about, and the main metadata I care about (choose your own list) is authorship, publish date, last update, subject keywords, thumbnail (OpenGraph 1200x630), and summary.

There’s a long list of additional metadata that I could put in my webpages because there are standardized ways to do it, but, why bother?

[rhdunn]

Dublin Core is effectively similar/related to schema.org's CreativeWork. If you have a creative work (audiobook, short story, news article, etc.) then Dublin Core is applicable, in addition to the corresponding CreativeWork subtype.

And yes, you should use whatever metadata is applicable to your site and test it against the search engines/etc. you want to support to make sure that they are reading the metadata correctly.