OpenFormula Syntax has Conflicting Definitions of Identifier

In ODF 1.2 CD05 Part 2, there are two different Syntax rules for the "Identifier" pattern in Section 5 Syntax.

The first one is in section 5.6 where we have

"""
FunctionName ::= Identifier

Identifier ::= LetterXML (LetterXML | DigitXML |'_' | '.' | CombiningCharXML)*

Where LetterXML, DigitXML, and CombiningCharXML are Letter, Digit, and CombiningChar as they are defined in [XML1.0].

Function names are case-insensitive.
"""

At the end of section 5.11, we have

"""
Identifier ::= ( LetterXML
(LetterXML | DigitXML | '_' | CombiningCharXML)* )

• ( [A-Za-z][0-9] )
• ([Tt][Rr][Uu][Ee]) - ([Ff][Aa][Ll][Ss][Ee])
  """

which is quite different. Also, all references to Identifiers in the Section 5 syntax rules are from Named Expression rules, apart from the single use of Identifier as an intermediate for FunctionName.