19.594 table:cell-range - value in ODF 1.0/1.1 was cellAddress, now cellRangeAddressList
This attribute is used by <chart:title>, <chart:subtitle>, and <chart:footer> but there is no explanation for obtaining text from a range of cells.
Suspect it is simply an error in the schema.
name remains unfortunate but correcting the datatype would fix the immediate issue.
Andreas spotted this error and Dennis has commented as well.