Imagine you are having a Blog Entry, which can relate to other Blog Entries. It could as simple as "BlogPost 1 extends BlogPost 2". Ideally you would like to show the information thon both blog post entries.
Where would you define the relation?
Easiest would be to define the relation on both Blogposts:
//1-post.mdx
---
id: 1
relations: [{ type: "extends", id: 2 }]
---
//2-post.mdx
---
id: 1
relations: [{ type: "extended by", id: 1 }]
---
What is the recommended way ?