DTD special characters in enumeration - Programmers Heaven

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DTD special characters in enumeration

I would like to insert in a DTD the following ATTLIST:

<!ATTLIST elem operator (=|<>) #REQUIRED>

but the validator tells me that the DTD is not valid, with this error:

Invalid item '=' in DTD ATTLIST Enumeration

Does someone know what I should write to have a correct DTD with the special characters I want to insert?



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