(Using NotePad++ XMLTools XML validator)
Validation of current file using XML schema:

(line 2642: <FCDA ldInst="PROT" prefix="mea" lnClass="MMXU" lnInst="1" doName="PhV" daName="" fc="MX"/>)



ERROR: Element '{http://www.iec.ch/61850/2003/SCL}FCDA', attribute 'daName': [facet 'pattern'] The value '' is not accepted by the pattern '[a-zA-Z][a-zA-Z0-9]*(\([0-9]+\))?(\.[a-zA-Z][a-zA-Z0-9]*(\([0-9]+\))?)*'.
ERROR: Element '{http://www.iec.ch/61850/2003/SCL}FCDA', attribute 'daName': '' is not a valid value of the atomic type '{http://www.iec.ch/61850/2003/SCL}tFullAttributeName'.

(file does validate according to schema 2007B)
(daName attribute cannot be empty according to schema)