# see  http://www.w3.org/TR/2000/REC-xml-20001006#NT-Name
my $XML_BaseChar= qr/@{[ "[" . # a character class...
   "\x{0041}-\x{005A}\x{0061}-\x{007A}\x{00C0}-\x{00D6}\x{00D8}-\x{00F6}\x{00F8}-\x{00FF}" .
   "\x{0100}-\x{0131}\x{0134}-\x{013E}\x{0141}-\x{0148}\x{014A}-\x{017E}\x{0180}-\x{01C3}\x{01CD}-\x{01F0}\x{01F4}-\x{01F5}" .
   "\x{01FA}-\x{0217}\x{0250}-\x{02A8}\x{02BB}-\x{02C1}" .
   "\x{0386}\x{0388}-\x{038A}\x{038C}\x{038E}-\x{03A1}\x{03A3}-\x{03CE}\x{03D0}-\x{03D6}\x{03DA}\x{03DC}\x{03DE}\x{03E0}\x{03E2}-\x{03F3}" .
   "\x{0401}-\x{040C}\x{040E}-\x{044F}\x{0451}-\x{045C}\x{045E}-\x{0481}\x{0490}-\x{04C4}\x{04C7}-\x{04C8}\x{04CB}-\x{04CC}\x{04D0}-\x{04EB}\x{04EE}-\x{04F5}\x{04F8}-\x{04F9}" .
   "\x{0531}-\x{0556}\x{0559}\x{0561}-\x{0586}\x{05D0}-\x{05EA}\x{05F0}-\x{05F2}" .
   "\x{0621}-\x{063A}\x{0641}-\x{064A}\x{0671}-\x{06B7}\x{06BA}-\x{06BE}\x{06C0}-\x{06CE}\x{06D0}-\x{06D3}\x{06D5}\x{06E5}-\x{06E6}" .
   "\x{0905}-\x{0939}\x{093D}\x{0958}-\x{0961}\x{0985}-\x{098C}\x{098F}-\x{0990}\x{0993}-\x{09A8}\x{09AA}-\x{09B0}\x{09B2}\x{09B6}-\x{09B9}\x{09DC}-\x{09DD}\x{09DF}-\x{09E1}\x{09F0}-\x{09F1}" .
   "\x{0A05}-\x{0A0A}\x{0A0F}-\x{0A10}\x{0A13}-\x{0A28}\x{0A2A}-\x{0A30}\x{0A32}-\x{0A33}\x{0A35}-\x{0A36}\x{0A38}-\x{0A39}\x{0A59}-\x{0A5C}\x{0A5E}\x{0A72}-\x{0A74}\x{0A85}-\x{0A8B}\x{0A8D}\x{0A8F}-\x{0A91}\x{0A93}-\x{0AA8}\x{0AAA}-\x{0AB0}\x{0AB2}-\x{0AB3}\x{0AB5}-\x{0AB9}\x{0ABD}\x{0AE0}" .
   "\x{0B05}-\x{0B0C}\x{0B0F}-\x{0B10}\x{0B13}-\x{0B28}\x{0B2A}-\x{0B30}\x{0B32}-\x{0B33}\x{0B36}-\x{0B39}\x{0B3D}\x{0B5C}-\x{0B5D}\x{0B5F}-\x{0B61}\x{0B85}-\x{0B8A}\x{0B8E}-\x{0B90}\x{0B92}-\x{0B95}\x{0B99}-\x{0B9A}\x{0B9C}\x{0B9E}-\x{0B9F}\x{0BA3}-\x{0BA4}\x{0BA8}-\x{0BAA}\x{0BAE}-\x{0BB5}\x{0BB7}-\x{0BB9}" .
   "\x{0C05}-\x{0C0C}\x{0C0E}-\x{0C10}\x{0C12}-\x{0C28}\x{0C2A}-\x{0C33}\x{0C35}-\x{0C39}\x{0C60}-\x{0C61}\x{0C85}-\x{0C8C}\x{0C8E}-\x{0C90}\x{0C92}-\x{0CA8}\x{0CAA}-\x{0CB3}\x{0CB5}-\x{0CB9}\x{0CDE}\x{0CE0}-\x{0CE1}" .
   "\x{0D05}-\x{0D0C}\x{0D0E}-\x{0D10}\x{0D12}-\x{0D28}\x{0D2A}-\x{0D39}\x{0D60}-\x{0D61}" .
   "\x{0E01}-\x{0E2E}\x{0E30}\x{0E32}-\x{0E33}\x{0E40}-\x{0E45}\x{0E81}-\x{0E82}\x{0E84}\x{0E87}-\x{0E88}\x{0E8A}\x{0E8D}\x{0E94}-\x{0E97}\x{0E99}-\x{0E9F}\x{0EA1}-\x{0EA3}\x{0EA5}\x{0EA7}\x{0EAA}-\x{0EAB}\x{0EAD}-\x{0EAE}\x{0EB0}\x{0EB2}-\x{0EB3}\x{0EBD}\x{0EC0}-\x{0EC4}" .
   "\x{0F40}-\x{0F47}\x{0F49}-\x{0F69}" .
   "\x{10A0}-\x{10C5}\x{10D0}-\x{10F6}" .
   "\x{1100}\x{1102}-\x{1103}\x{1105}-\x{1107}\x{1109}\x{110B}-\x{110C}\x{110E}-\x{1112}\x{113C}\x{113E}\x{1140}\x{114C}\x{114E}\x{1150}\x{1154}-\x{1155}\x{1159}\x{115F}-\x{1161}\x{1163}\x{1165}\x{1167}\x{1169}\x{116D}-\x{116E}\x{1172}-\x{1173}\x{1175}\x{119E}\x{11A8}\x{11AB}\x{11AE}-\x{11AF}\x{11B7}-\x{11B8}\x{11BA}\x{11BC}-\x{11C2}\x{11EB}\x{11F0}\x{11F9}" .
   "\x{1E00}-\x{1E9B}\x{1EA0}-\x{1EF9}" .
   "\x{1F00}-\x{1F15}\x{1F18}-\x{1F1D}\x{1F20}-\x{1F45}\x{1F48}-\x{1F4D}\x{1F50}-\x{1F57}\x{1F59}\x{1F5B}\x{1F5D}\x{1F5F}-\x{1F7D}\x{1F80}-\x{1FB4}\x{1FB6}-\x{1FBC}\x{1FBE}\x{1FC2}-\x{1FC4}\x{1FC6}-\x{1FCC}\x{1FD0}-\x{1FD3}\x{1FD6}-\x{1FDB}\x{1FE0}-\x{1FEC}\x{1FF2}-\x{1FF4}\x{1FF6}-\x{1FFC}" .
   "\x{2126}\x{212A}-\x{212B}\x{212E}\x{2180}-\x{2182}" .
   "\x{3041}-\x{3094}\x{30A1}-\x{30FA}\x{3105}-\x{312C}" .
   "\x{AC00}-\x{D7A3}" .
   "]"  ]}/;
my $XML_Ideographic= qr/[\x{4E00}-\x{9FA5}\x{3007}\x{3021}-\x{3029}]/;
my $XML_Digit= qr/[\x{30}-\x{39}\x{660}-\x{669}\x{6F0}-\x{6F9}\x{966}-\x{96F}\x{9E6}-\x{9EF}\x{A66}-\x{A6F}\x{AE6}-\x{AEF}\x{B66}-\x{B6F}\x{BE7}-\x{BEF}\x{C66}-\x{C6F}\x{CE6}-\x{CEF}\x{D66}-\x{D6F}\x{E50}-\x{E59}\x{ED0}-\x{ED9}\x{F20}-\x{F29}]/;
my $XML_CombiningChar= qr/@{[ "[" . # a character class...
   "\x{300}-\x{345}\x{360}-\x{361}" .
   "\x{483}-\x{486}" .
   "\x{591}-\x{5A1}\x{5A3}-\x{5B9}\x{5BB}-\x{5BD}\x{5BF}\x{5C1}-\x{5C2}\x{5C4}" .
   "\x{64B}-\x{652}\x{670}\x{6D6}-\x{6DC}\x{6DD}-\x{6DF}\x{6E0}-\x{6E4}\x{6E7}-\x{6E8}\x{6EA}-\x{6ED}" .
   "\x{901}-\x{903}\x{93C}\x{93E}-\x{94C}\x{94D}\x{951}-\x{954}\x{962}-\x{963}\x{981}-\x{983}\x{9BC}\x{9BE}\x{9BF}\x{9C0}-\x{9C4}\x{9C7}-\x{9C8}\x{9CB}-\x{9CD}\x{9D7}\x{9E2}-\x{9E3}" .
   "\x{A02}\x{A3C}\x{A3E}\x{A3F}\x{A40}-\x{A42}\x{A47}-\x{A48}\x{A4B}-\x{A4D}\x{A70}-\x{A71}\x{A81}-\x{A83}\x{ABC}\x{ABE}-\x{AC5}\x{AC7}-\x{AC9}\x{ACB}-\x{ACD}" .
   "\x{B01}-\x{B03}\x{B3C}\x{B3E}-\x{B43}\x{B47}-\x{B48}\x{B4B}-\x{B4D}\x{B56}-\x{B57}\x{B82}-\x{B83}\x{BBE}-\x{BC2}\x{BC6}-\x{BC8}\x{BCA}-\x{BCD}\x{BD7}" .
   "\x{C01}-\x{C03}\x{C3E}-\x{C44}\x{C46}-\x{C48}\x{C4A}-\x{C4D}\x{C55}-\x{C56}\x{C82}-\x{C83}\x{CBE}-\x{CC4}\x{CC6}-\x{CC8}\x{CCA}-\x{CCD}\x{CD5}-\x{CD6}" .
   "\x{D02}-\x{D03}\x{D3E}-\x{D43}\x{D46}-\x{D48}\x{D4A}-\x{D4D}\x{D57}" .
   "\x{E31}\x{E34}-\x{E3A}\x{E47}-\x{E4E}\x{EB1}\x{EB4}-\x{EB9}\x{EBB}-\x{EBC}" .
   "\x{EC8}-\x{ECD}" .
   "\x{F18}-\x{F19}\x{F35}\x{F37}\x{F39}\x{F3E}\x{F3F}\x{F71}-\x{F84}\x{F86}-\x{F8B}\x{F90}-\x{F95}\x{F97}\x{F99}-\x{FAD}\x{FB1}-\x{FB7}\x{FB9}" .
   "\x{20D0}-\x{20DC}\x{20E1}\x{302A}-\x{302F}\x{3099}\x{309A}" .
   "]"  ]}/;
my $XML_Extender= qr/[\x{B7}\x{2D0}\x{2D1}\x{387}\x{640}\x{E46}\x{EC6}\x{3005}\x{3031}-\x{3035}\x{309D}-\x{309E}\x{30FC}-\x{30FE}]/;
my $XML_Letter= qr/$XML_BaseChar|$XML_Ideographic/;
my $XML_NameChar= qr/$XML_Letter|$XML_Digit|$XML_CombiningChar|$XML_Extender|[.-_:]/;
my $XML_Name= qr/(?:$XML_Letter|[_:])$XML_NameChar*/;

sub OK_name ($)
 {
 return $_[0] =~ /^$XML_Name$/o;
 }