three hyphen in YAML file

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Hi,

My understanding of "---" yaml file hyphens is, multiple documents within a single stream are separated by three hyphens

But I have seen in many example just in the beginning of the YAML file only they use three hyphens

If the same file use another document it, then they don't start with --- hyphens

example below

test.yaml
---
user::user_list:

  name1:
    id: 123
  name2:
    id: 456

  occupation::emp_id
    job:
      designation: programer

So in this file we use two different thing one is for emp id detiais and the another is for job details,then why we didn't use "---" in between these, two like below

test.yaml
    ---
    user::user_list:

      name1:
        id: 123
      name2:
        id: 456
    ---
      occupation::emp_id
        job:
          designation: programer

Please correct me if my understanding is wrong