To be honest I didn’t pay attention to this detail, I guess it wouldn’t make much a difference.
/ is how you actually use namespace functionality in Logseq. Check my post with tips on when and how use this:
Logseq will save [[Parent/Child]] as Parent__Child.md on the file system, so no need to worry about it.
At the moment you can’t use : inside a key, but you can use namespaces, numbers and underscores as keys, like:
verb/describe_1:: value
In general keys must start with a non-numeric character and can contain alphanumeric characters and . * + ! - _ ? $ % & = < >.
If -, + or . are the first character, the second character (if any) must be non-numeric.
You can decide that one of those special character stands for “verb” and use something like:
>/describe:: value
This way when you visit the page [[>]] you will see the list of verbs like “describe” at the bottom.