Add meta element to info

[Bob Stayton <bobs@sagehill.net>]

Here is the first issue from Norm's list. He has proposed:

PR 155, Add a general 'meta' element in info. The element would be <meta name="foo" content="bar"/>, and would provide a mechanism for adding miscellaneous metadata in the content attribute, with a name attribute to specify its purpose. This PR implements the change suggested in Issue #153. https://github.com/docbook/docbook/pull/155

I'm in favor of this change. It adds a lightweight (empty) element to support capturing small bits of metadata that don't fit any of the other info categories. It's limited because the data has to fit in an attribute value, but I think that's ok. I've frequently needed something like this.

Discussion?

-- 
Bob Stayton
bobs@sagehill.net