What do excel xml cell attribute values mean?
r= References= Style Indext= Cell Data Type
The documentation for the Cell class is here
The possible cell data types are:
b- booleand- date in ISO8601 formate- errorinlineStr- string that doesn't use the shared string tablen- numbers- shared stringstr- formula string
These values are in section 18.18.11 of the ECMA-376 standard which can be found here (specifically they are on pages 2442-2443 of the PDF file in the ECMA-376 4th edition part 1 download)
Looking at the XML schema later in that PDF file (page 3912, line 2301), the use of the t attribute is optional and the default value is n - i.e. a number
Part 1 of the 5th edition of the ECMA-476 spec was released in 2016. The equivalent page references for the 5th edition are: page 2451 for the documentation of ST_CellType and page 3928, line 2301 for the ST_CellType entry in the XML schema