// LDAP Configuration Constants
    // ============================================================

    /** LDAP base DN configuration key. */
    public static final String LDAP_BASE_DN = "ldap.base.dn";

    /** LDAP security principal configuration key. */
    public static final String LDAP_SECURITY_PRINCIPAL = "ldap.security.principal";

    public static final String LABELS_LDAP_PROVIDER_URL = "{labels.ldapProviderUrl}";

    /** The key of the message: User DN */
    public static final String LABELS_LDAP_SECURITY_PRINCIPAL = "{labels.ldapSecurityPrincipal}";

    /** The key of the message: Bind DN */
    public static final String LABELS_LDAP_ADMIN_SECURITY_PRINCIPAL = "{labels.ldapAdminSecurityPrincipal}";

     */
    String getLdapAdminUserFilter();

    /**
     * Get the value for the key 'ldap.admin.user.base.dn'. <br>
     * The value is, e.g. ou=People,dc=fess,dc=codelibs,dc=org <br>
     * comment: Base DN for LDAP admin user.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAdminUserBaseDn();

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