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Definition(s):

To precede printable non-alphanumeric characters (e.g., *, $, ?) with the backslash ( \) escape character in a value string. When a non-alphanumeric character is quoted in a WFN, it SHALL be processed as string data. When a non-alphanumeric character is unquoted in a WFN, it may be interpreted as a special character by CPE 2.3 specifications, including this one.
Source(s):
NISTIR 7696

Glossary Comments

Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.

Comments about the glossary's presentation and functionality should be sent to secglossary@nist.gov.

See NISTIR 7298 Rev. 3 for additional details.