Rhino.Xmlimpl.XMLName.IsNCNameStartChar C# (CSharp) Method

		private static bool IsNCNameStartChar(int c)
		{
			if ((c & ~unchecked((int)(0x7F))) == 0)
			{
				// Optimize for ASCII and use A..Z < _ < a..z
				if (c >= 'a')
				{
					return c <= 'z';
				}
				else
				{
					if (c >= 'A')
					{
						if (c <= 'Z')
						{
							return true;
						}
						return c == '_';
					}
				}
			}
			else
			{
				if ((c & ~unchecked((int)(0x1FFF))) == 0)
				{
					return (unchecked((int)(0xC0)) <= c && c <= unchecked((int)(0xD6))) || (unchecked((int)(0xD8)) <= c && c <= unchecked((int)(0xF6))) || (unchecked((int)(0xF8)) <= c && c <= unchecked((int)(0x2FF))) || (unchecked((int)(0x370)) <= c && c <= unchecked((int)(0x37D))) || unchecked((int)(0x37F)) <= c;
				}
			}
			return (unchecked((int)(0x200C)) <= c && c <= unchecked((int)(0x200D))) || (unchecked((int)(0x2070)) <= c && c <= unchecked((int)(0x218F))) || (unchecked((int)(0x2C00)) <= c && c <= unchecked((int)(0x2FEF))) || (unchecked((int)(0x3001)) <= c && c <= unchecked((int)(0xD7FF))) || (unchecked((int)(0xF900)) <= c && c <= unchecked((int)(0xFDCF))) || (unchecked((int)(0xFDF0)) <= c && c <= unchecked((int)
				(0xFFFD))) || (unchecked((int)(0x10000)) <= c && c <= unchecked((int)(0xEFFFF)));
		}