[Understanding DIDs in Greater Depth] What is the justification for the new "$" and "!" operators?

[mwherman2000]

@talltree What is the justification for the new

1. "$" operator?
2. "!" operator?

"$" is particularly problematic because "$" is already in common usage in many accepted international specifications for URLs:

• OASIS/ISO OData System Query Options: http://docs.oasis-open.org/odata/odata/v4.01/cs01/part2-url-conventions/odata-v4.01-cs01-part2-url-conventions.html#_Toc505773217

Reference:

• did-url Use Cases: did-url Syntax Examples (and corresponding HTTP Binding Examples) w3c/did-resolution#32