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Thank you. I guess I misread. "For example, e-mails and urls are a special syntax. Their value space..." seemed to talk about the 'value space' of strings (the

Thank you. I guess I misread. "For example, e-mails and urls are a special syntax. Their value space..." seemed to talk about the 'value space' of strings (these being e-mails and urls), not types (of e-mails and urls), which confused me.

acchow 3y ago
It is bout the 'value space' of strings. Think of all possible strings. That is the entire value space of strings. Not every possible string is an email. Only a subset of this value space is a valid email. This subset is the 'value space' of strings which are valid emails.