Given an entity looks up unicode code points that represent it.

>>> entityCodePoints "μ"
Just [966]

>>> entityCodePoints "&nano;"
Nothing

Given an entity returns it's textual representation (if any).

>>> entityChars "μ"
Just "μ"

>>> entityChars "&nano;"
Nothing

Check if entity is valid (if such entity exists).

>>> isValidEntity "μ"
True

>>> isValidEntity "&nano;"
False

Given a name of entity looks up code points that represent it.

>>> entityNameCodePoints "mu"
Just [966]

>>> entityNameCodePoints "nano"
Nothing

Given a name of entity returns it's textual representation (if any).

>>> entityNameChars "mu"
Just "μ"

>>> entityNameChars "nano"
Nothing

Check if entity name is valid (if corresponding entity exists).

>>> isValidEntityName "mu"
True

>>> isValidEntityName "nano"
False