2. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", and "MAY" in this document are to be interpreted as described in [RFC2119].
Character names in this document use the notation for code points and names from the Unicode Standard [Unicode]. For example, the letter "a" may be represented as either <U+0061> or <LATIN SMALL LETTER A>.
Note: a glossary of terms used in Unicode can be found in [Glossary]. Information on the Unicode character encoding model can be found in [CharModel].
The term "transport connection" refers to the underlying transport services used to carry the protocol exchange, as well as associations established by these services.
The term "TLS layer" refers to Transport Layer Security (TLS) services used in providing security services, as well as associations established by these services.
The term "SASL layer" refers to Simple Authentication and Security Layer (SASL) services used in providing security services, as well as associations established by these services.
The term "LDAP message layer" refers to the LDAP Message Protocol Data Unit (PDU) services used in providing directory services, as well as associations established by these services.
The term "LDAP session" refers to combined services (transport connection, TLS layer, SASL layer, LDAP message layer) and their associations.
See the table in Section 5 for an illustration of these four terms.