Ability to construct documents in part using links to other documents and predicates

Example use cases:

• Allows a user to create a persuasive document that includes a curated set of ideas from existing annotated database objects like documents and propositions which have already been voted on (of course, there can always be the claim that such propositions are being taken out of context, but readers can also find the original context associated with the proposition).
• Construct a poll from a set of question documents and associated predicates to vote on.
• Construct an answer to a question from multiple existing answers.

My original thought was we would need some complicated UI features to do this, but @djankov suggested we could simply use some form of markup syntax, which I think is a better idea. Here's a chatgpt session I had about this idea:

https://chatgpt.com/share/689cf93d-49dc-8006-a6d5-fdfae2a6ffbd