The values depend on the type. For example, a mail attribute might contain the value "donald.duck@disney.com". A jpegPhoto attribute would contain a photograph in binary JPEG/JFIF format."
RFC 1778 describes the formats for some of the more common attribute types, like mail or jpegPhoto.
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Taken from Lightweight Directory Access Protocol:
"An LDAP directory entry is a collection of attributes with a name, called a distinguished name (DN). The DN refers to the entry unambiguously.
Each of the entry's attributes has a type and one or more values. The types are typically mnemonic strings, like "cn" for common name, or "mail" for e-mail address.External sites
RFC 1778 The String Representation of Standard Attribute Syntaxes - IETF