WS
  U+0009..U+000A
  U+000D
  U+0020
PN_CHARS_BASE
  U+0041..U+005A
  U+0061..U+007A
  U+00C0..U+00D6
  U+00D8..U+00F6
  U+00F8..U+02FF
  U+0370..U+037D
  U+037F..U+1FFF
  U+200C..U+200D
  U+2070..U+218F
  U+2C00..U+2FEF
  U+3001..U+D7FF
  U+F900..U+FDCF
  U+FDF0..U+FFFD
  U+10000..U+EFFFF
PN_CHARS_U
  U+0041..U+005A
  U+005F
  U+0061..U+007A
  U+00C0..U+00D6
  U+00D8..U+00F6
  U+00F8..U+02FF
  U+0370..U+037D
  U+037F..U+1FFF
  U+200C..U+200D
  U+2070..U+218F
  U+2C00..U+2FEF
  U+3001..U+D7FF
  U+F900..U+FDCF
  U+FDF0..U+FFFD
  U+10000..U+EFFFF
PN_CHARS
  U+002D
  U+0030..U+0039
  U+0041..U+005A
  U+005F
  U+0061..U+007A
  U+00B7
  U+00C0..U+00D6
  U+00D8..U+00F6
  U+00F8..U+037D
  U+037F..U+1FFF
  U+200C..U+200D
  U+203F..U+2040
  U+2070..U+218F
  U+2C00..U+2FEF
  U+3001..U+D7FF
  U+F900..U+FDCF
  U+FDF0..U+FFFD
  U+10000..U+EFFFF
VARNAME first scalar
  U+0030..U+0039
  U+0041..U+005A
  U+005F
  U+0061..U+007A
  U+00C0..U+00D6
  U+00D8..U+00F6
  U+00F8..U+02FF
  U+0370..U+037D
  U+037F..U+1FFF
  U+200C..U+200D
  U+2070..U+218F
  U+2C00..U+2FEF
  U+3001..U+D7FF
  U+F900..U+FDCF
  U+FDF0..U+FFFD
  U+10000..U+EFFFF
VARNAME later scalar
  U+0030..U+0039
  U+0041..U+005A
  U+005F
  U+0061..U+007A
  U+00B7
  U+00C0..U+00D6
  U+00D8..U+00F6
  U+00F8..U+037D
  U+037F..U+1FFF
  U+200C..U+200D
  U+203F..U+2040
  U+2070..U+218F
  U+2C00..U+2FEF
  U+3001..U+D7FF
  U+F900..U+FDCF
  U+FDF0..U+FFFD
  U+10000..U+EFFFF
IRIREF content
  U+0021
  U+0023..U+003B
  U+003D
  U+003F..U+005B
  U+005D
  U+005F
  U+0061..U+007A
  U+007E..U+D7FF
  U+E000..U+10FFFF
