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9.7.4. Hexadecimal Literals
Hexadecimal values can be specified literally in two ways, prefixing the plain value with '0x' or enclosed with single quotes prefixed with 'X'. The case is not important. Hex characters should always be pairs, representing a single byte, and should be at least on pair. Here are some examples:
X'beef' - valid 0xbeef - valid X'abeef' - not valid X'0abeef' - valid X'' - not valid
X'<value>'
is equivalent
to 0x<value>