Understand macro extension

[XFFA.IR Bot]

In XenForo core templates:
post_question_macros template has <xf:macro name="answer" extends="post_macros::post">
What does it mean?
According to this post:

XenForo said:
When calling a macro, we now generally prefer <xf:macro name="template_name::macro_name"> over <xf:macro template="template_name" name="macro_name"> although both options are supported.
Click to expand...

"post" is supposed to be the macro...

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