Rules

Name	Description	Scope	Level
Spaces	No leading space	Line	Warning
Spaces	No trailing space	Line	Warning
Lowercase	Rule is lowercase	Rule	Error
Dots	Rule doesn't start with a dot	Rule	Error
Dots	Rule doesn't end with a dot	Rule	Error
EmptyLabels	Rule doesn't contain empty labels (double dots)	Rule	Error

Proposed

Name	Description	Scope	Level
UTF8	Rule is UTF-8/ASCII	Rule	Error
Spaces	Rule doesn't contain spaces Catched by AllowedChars	Rule	Error
Punycode	Rule is punycode	Rule	Error
LeftException	Rule is an exception but the exception is not the left outermost token	Rule	Error
LeftWildcard	Rule is a wildcard but the wildcard is not the left outermost token	Rule	Error
AllowedChars	Rule contains only allowed chars: [0-9a-z-!*.]	Rule	Error
Label	Label must be of ([0-9a-z-] | valid UTF-8)	Rule	Error
Duplicates	Rule is duplicate	Rule	Warning
Ambiguous	Rule is ambiguous (e.g. xyz + !xyz)	Rule	Error
Section Begin/End	Section END must match exactly one previous section BEGIN (the correct one)	Rule	Error
Section Overlap	Sections must not overlap	Rule	Error
Section Missing	There must be exactly one ICANN and one PRIVATE section (and nothing else)	Rule	Error
Section Match	There must be no rule outside a section	Rule	Error
Order	'Subsections' are ordered by # of labels, alphabetical label-by-label (right-to-left) This needs official suport. There are many ordering faults in the current PSL. Sometimes even rules with different TLDs mixed in one group. There is test code in my Python PSL Linter that you can uncomment - those two calls to check_order().	Rule	Warning
Exception without Wildcard	An exception requires a matching wildcard rule	Rule	Error
Rule covered by Wildcard	A normal rule should not be covered by wildcard (redundant)	Rule	Warning