Karen：

您好，謝謝您的提問，佩服您看得這麼仔細!

MARC 21的505字段格式化內容的著錄，據LC官網是依據AACR2及ISBD標點符號規則，但也只提到分項符號--，至於其它並未有詳細的說明，因此，編目機構可根據本地讀者需要，自定其標點符號著錄慣例，以求編目的一致性。

在英文環境下，對章節的書寫慣例是：No. 1.  或 Part 1. 這是書寫著錄慣例，非著錄規則。國圖採用逗點（，）是沿用原先的著錄慣例。在美國一般是依循LC/PCC PS 25.1.1.3著錄方式：不著錄章節號，並採用（.）。如：
505 00 $g 1. The $t Living machine -- $g 1. The $t blue planet  ..........

參考：

1. LC官網505段說明:
Punctuation - Field 505 ends with a period when the field contains complete or partial contents, unless another mark of punctuation or a closing angle bracket (<>) is present or unless the contents continue in another occurrence of field 505. If the field contains incomplete contents, no period is recorded, unless the last word, initial/letter, or abbreviation ends in a period.
In records formulated according to AACR 2, a space-hyphen-hyphen-space ( -- ) is recorded between each item in the contents note unless a delimiter/subfield code follows in which case there is no ending space. In pre-AACR 2 records, items are separated by a period-hyphen-hyphen (.--).
Contents notes may contain prescribed ISBD punctuation (e.g., statements of responsibility are preceded by a space-slash-space ( / )).
Temporary Data - Angle brackets (<...>) are customarily used to enclose holdings of individual volumes, within contents notes that are subject to change.

2. LC-PCC PS 25.1.1.3

RECORDING RELATIONSHIPS TO RELATED WORKS

Formal Contents Notes (Structured Descriptions)

LC practice/PCC practice: Create a formal contents note as follows:

1. Use the appropriate value in indicator 1 of MARC field 505 (Formatted Contents Note) to indicate the character of the note, e.g., "Contents:"; "Incomplete contents:"; "Partial contents:".

2. Record the title proper that appears in the source that provides the best identification; however, if the title appears on the title page, normally use the title page title; generally give other title information only when the title proper would be meaningless without it or when it would greatly enhance keyword searching.

3. When the contents listed have different statements of responsibility, generally record a first statement of responsibility for each title proper recorded in the contents note.

4. Generally omit prefatory and similar matter of little importance.

5. For publications in one volume:

a) Omit chapter and section numbering.

b) Use a space-dash-space to separate the components.

6. For publications in two or more volumes:

a) Give the volume designation that is found on the resource; separate the volume designation from the title by a period-space.

b) If the number of physical volumes differs from the number of bibliographic volumes, include the number of physical volumes within parentheses after the title (or after the title and statement of responsibility).

c) Separate each volume with a space-dash-space; if the set is incomplete, put the space-dash-space before each title (other than the first) that is being recorded and leave four spaces for the missing volume; if two or more titles are being transcribed for one volume, apply the punctuation conventions from RDA D.1.2.2 such that the titles by the same person, body, etc., are separated by a space-semicolon-space and titles by different persons, bodies, etc., are separated by a period-space.

d) When some of the volumes in a multipart publication have their own titles and some of the volumes do not, and it is decided to make a formal contents note, use the statement "[without special title]" to represent the untitled volumes.

錢月蓮敬答  20150429