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1 wakaba 1.1 <?xml version="1.0" encoding="iso-2022-jp"?>
2     <!DOCTYPE rfc SYSTEM "rfc2629.dtd" [
3     <!ENTITY rfc.number "1873">
4     <!ENTITY ja.access "$B@\B3(B">
5     <!ENTITY ja.object "$BJ*BN(B">
6     <!ENTITY ja.optional "$B>JN,2DG=(B">
7     <!ENTITY ja.security "$B0BA4@-(B">
8     <!ENTITY ja.system "$B=hM}7O(B">
9     <!ENTITY ja.text "$B%F%-%9%H(B">
10     <!ENTITY ja.user-agent "$BMxMQ<TBeM}<T(B">
11     <!ENTITY ja.mail.body "$BK\J8(B">
12     <!ENTITY ja.mail.header "$BF,(B">
13     <!ENTITY ja.mime.body-part "$BK\J8ItJ,(B">
14     <!ENTITY ja.mime.entity "$B<BBN(B">
15     <!ENTITY ja.mime.multipart "$BB?ItJ,(B">
16     <!ENTITY ja.mime.part "$BItJ,(B">
17     <!ENTITY ja.mime.parameter "$B%Q%i%a!<%?!<(B">
18     ]>
19     <?rfc symrefs="yes"?>
20     <rfc number="&rfc.number;" category="exp"
21     xmlns:myns="mailto:julian.reschke@greenbytes.de?subject=rcf2629.xslt"
22     xmlns:ja="http://suika.fam.cx/~wakaba/lang/rfc/translation/"
23     xmlns:h="http://www.w3.org/1999/xhtml">
24     <front>
25     <title>Message/External-Body Content-ID Access Type</title>
26     <ja:title xml:lang="ja">Message/External-Body Content-ID &ja.access;$B7?(B</ja:title>
27     <author initials="E." surname="Levinson" fullname="Edward Levinson">
28     <organization>Accurate Information Systems, Inc.</organization>
29     <address>
30     <postal>
31     <street>2 Industrial Way</street>
32     <city>Eatontown</city> <region>NJ</region>
33     <code>07724-2265</code>
34     <country ja:text="USA">US</country>
35     </postal>
36     <phone>+1 908 389 5550</phone>
37     <email>ELevinson@Accurate.com</email>
38     </address>
39     </author>
40     <author initials="J." surname="Clark" fullname="James Clark">
41     <address>
42     <postal>
43     <street>90 Clarendon Road</street>
44     <city>London W11 2HR</city>
45     <country ja:text="UK">GB</country>
46     </postal>
47     <email>jjc@jclark.com</email>
48     </address>
49     </author>
50     <date month="December" year="1995" />
51     <abstract>
52     <t>
53     <ja:pair>
54     <ja:l xml:lang="en">
55     When using MIME <xref target="MIME" /> to encapsulate a
56     structured object that
57     consist of many elements, for example an SGML <xref target="SGML" />
58     document, a
59     single element may occur several times. An encapsulation normally
60     maps each of the structured objects elements to a MIME entity. It is
61     useful to include elements that occur multiple time exactly once. To
62     accomplish that and to preserve the object structure it is desirable
63     to unambiguously refer to another body part of the same message.
64     </ja:l>
65     <ja:l xml:lang="ja">
66     MIME <xref target="MIME" /> $B$r;H$C$FB?$/$NMWAG$G9=@.$5$l$k9=B$2=(B&ja.object;,
67     $BNc$($P(B SGML <xref target="SGML" />
68     $BJ8=q$r%+%W%;%k2=$9$k;~!"0l$D$NMWAG$,4vEY$b=P8=$9$k$+$b$7$l$^$;$s!#%+%W%;%k2=$ODL>o3F9=B$2=(B&ja.object;$BMWAG$H(B
69     MIME $B<BBN$rBP1~$5$;$^$9!#J#?t2s8=$l$kMWAG$r0l$D$@$14^$a$k$3$H$,=PMh$l$PJXMx$G$9!#$3$l$rC#@.$7$+$D(B&ja.object;$B9=B$$rJ]$D$?$a!"F1$8%a%C%;!<%8$NB>$N(B&ja.mime.body-part;$B$r[#KfL5$/;2>H=PMh$k$N$,K>$^$7$$$G$7$g$&!#(B
70     </ja:l>
71     </ja:pair>
72     </t>
73     <t>
74     <ja:pair>
75     <ja:l xml:lang="en">
76     The existing MIME Content-Type Message/External-Body access-types
77     allow a MIME entity (body-part) to refer to an object that is not in
78     the message by specifying how to access that object. The Content-ID
79     access method described in this document provides the capability to
80     refer to an object within the message.
81     </ja:l>
82     <ja:l xml:lang="ja">
83     $B4{B8$N(B MIME Content-Type Message/External-Body access-type
84     $B$G$O(B MIME &ja.mime.entity; (&ja.mime.body-part;)
85     $B$,!"%a%C%;!<%8Cf$KL5$$(B&ja.object;$B$r!";XDj$7$?(B&ja.object;$B$X$N(B&ja.access;$BJ}K!$G;2>H$9$k$3$H$,=PMh$^$7$?!#$3$NJ8=q$G@bL@$9$k(B
86     Content-ID &ja.access;$BJ}K!$O!"%a%C%;!<%8Cf$N(B&ja.object;$B$r;2>H$9$kJ}K!$rDs6!$7$^$9!#(B
87     </ja:l>
88     </ja:pair>
89     </t>
90     </abstract>
91     </front>
92     <ja:front>
93     <author fullname="$B$o$+$P(B" ja:id="wakaba">
94     <address>
95     <email>w@suika.fam.cx</email>
96     <uri>http://suika.fam.cx/~wakaba/</uri>
97     </address>
98     </author>
99     <ja:change>
100     <ja:item year="2002" month="05" day="20"><author ja:ref="wakaba" />
101     <t>$BF|K\8l$KK]Lu!#(B</t>
102     </ja:item>
103     <ja:item year="2002" month="07" day="26"><author ja:ref="wakaba" />
104     <t><ja:link type="rfc" number="2629" /> $B$G%^!<%/IU$1!#(B</t>
105     </ja:item>
106     </ja:change><!-- $Date: 2002/05/20 12:30:02 $ -->
107     </ja:front>
108     <middle>
109    
110     <section title="Introduction">
111     <t>
112     <ja:pair>
113     <ja:l xml:lang="en">
114     Consider a MIME multipart entity several of whose body parts contain
115     the same data (body) but different parameters or Content-* headers.
116     Representing those body parts without duplicating the data in each
117     one promotes efficient use of resources (bandwidth and storage
118     space). To achieve these benefits an access-type is defined that
119     permits one message part to refer to another one in the same message.
120     </ja:l>
121     <ja:l xml:lang="ja">
122     MIME &ja.mime.multipart;&ja.mime.entity;$B$G!"$=$N(B&ja.mime.body-part;$B$N4v$D$+$OF1$8%G!<%?(B
123     (&ja.mail.body;) $B$G$"$k$,!"%Q%i%a!<%?!<$d(B
124     Content-* &ja.mail.header;$B$,0c$C$F$$$k>l9g$r9M$($F$_$F2<$5$$!#$3$l$i$N(B&ja.mime.body-part;$B$r!"%G!<%?$rFs=E$K$;$:$K$=$l$>$l0l2s$:$DI=8=$9$k$3$H$G!";q8;(B
125     ($BBS0h$dJ]4I6u4V(B) $B$rG=N(E*$K;H$&$3$H$rB%?J=PMh$^$9!#$=$3$G!"(B
126     $B$"$k%a%C%;!<%8(B&ja.mime.part;$B$,F1$8%a%C%;!<%8Cf$NB>$N(B&ja.mime.part;$B$r;2>H=PMh$k(B
127     access-type $B$rDj5A$7$^$9!#(B
128     </ja:l>
129     </ja:pair>
130     </t>
131     </section>
132    
133     <section title="The Content-ID Access Type" ja:title-ja="Content-ID &ja.access;$B7?(B">
134    
135     <section title="Registration Information" ja:title-ja="$BEPO?>pJs(B">
136     <list style="hanging">
137     <t hangText="MIME access-type name" ja:hangText-ja="MIME access-type $BL>(B">content-id</t>
138    
139     <t hangText="Required parameters" ja:hangText-ja="$BI,?\(B&ja.mime.parameter;"><ja:pair>
140     <ja:l xml:lang="en">none</ja:l>
141     <ja:l xml:lang="ja">$B$J$7(B</ja:l>
142     </ja:pair></t>
143    
144     <t hangText="Optional parameters" ja:hangText-ja="&ja.optional;&ja.mime.parameter;"><ja:pair>
145     <ja:l xml:lang="en">none</ja:l>
146     <ja:l xml:lang="ja">$B$J$7(B</ja:l>
147     </ja:pair></t>
148    
149     <t hangText="Published specification" ja:hangText-ja="$B=PHG$5$l$?;EMM=q(B"><ja:pair>
150     <ja:l xml:lang="en">this document</ja:l>
151     <ja:l xml:lang="ja">$B$3$NJ8=q(B</ja:l>
152     </ja:pair></t>
153    
154     <t hangText="Person &amp; email address to contact for further information" ja:hangText-ja="$B>\$7$$>pJs$NO"Mm@h$N?M$HEE;R%a%$%k!&%"%I%l%9(B">
155     Ed Levinson <ja:mail>ELevinson@accurate.com</ja:mail>
156     </t>
157    
158     <t hangText="Additional requirements" ja:hangText-ja="$BDI2C$NMW7o(B">
159    
160     <t>
161     <ja:pair>
162     <ja:l xml:lang="en">
163     The content-id header of the access-type=content-id MIME
164     entity must match (be identical to) exactly one content-id
165     in the same message, excluding other access-type=content-id
166     entities. Thus, the content-id access type can only occur
167     within a multipart message and can refer to another body
168     part anywhere in the same message.
169     </ja:l>
170     <ja:l xml:lang="ja">
171     <h:code>access-type=content-id</h:code> MIME
172     &ja.mime.entity;$B$N(B content-id &ja.mail.header;$B$O!"B>$N(B
173     <h:code>access-type=content-id</h:code>
174     $B$N(B&ja.mime.entity;$B$r=|$$$F!"F1$8%a%C%;!<%8Cf$NCzEY0l$D$N(B
175     content-id $B$H$N$_0lCW$9$k(B ($BF10l$G$"$k(B)
176     $B$b$N$G$J$1$l$P$J$j$^$;$s!#$G$9$+$i!"(B
177     content-id &ja.access;$B7?$O(B&ja.mime.multipart;$B%a%C%;!<%8Cf$G$N$_;H$&$3$H$,=PMh$^$9$7!"F1$8%a%C%;!<%8Cf$N$I$3$K$"$kB>$N(B&ja.mime.body-part;$B$r$b;2>H$9$k$3$H$,=PMh$^$9!#(B
178     </ja:l>
179     </ja:pair>
180     </t>
181    
182     <t>
183     <ja:pair>
184     <ja:l xml:lang="en">
185     A MIME User Agent (MUA) constructs the resultant MIME
186     body part as described below. We call the
187     access-type=content-id MIME entity the referring body
188     part and the MIME body part to which it refers,
189     the one with the matching content-id, the referenced
190     body part. The MIME entity that results from
191     content-id access type consists of:
192     </ja:l>
193     <ja:l xml:lang="ja">
194     MIME &ja.user-agent; (<h:abbr xml:lang="en">MUA</h:abbr>)
195     $B$O7k2L$H$7$F@8$8$k(B MIME
196     &ja.mime.body-part;$B$r<!$K@bL@$9$k$h$&$K$7$F9=C[$7$^$9!#$3$3$G!"(B
197     <ja:definition word="referring body part" translation="$B;2>H$9$k(B&ja.mime.body-part;"><h:code>access-type=content-id</h:code>
198     $B$N(B MIME
199     &ja.mime.entity;</ja:definition>$B$r;2>H$9$k(B&ja.mime.body-part;$B$H(B,
200     <ja:definition word="referenced body part" translation="$B;2>H$5$l$k(B&ja.mime.body-part;">$B;2>H$9$k(B&ja.mime.body-part;$B$,;2>H$9$k(B MIME &ja.mime.body-part;,
201     $B$D$^$j0lCW$9$k(B content-id
202     $B$r;}$D$b$N(B</ja:definition>$B$r;2>H$5$l$k(B&ja.mime.body-part;$B$H8F$S$^$9!#(B
203     content-id &ja.access;$B7?$N7k2L$N(B MIME
204     &ja.mime.entity;$B$O<!$N$b$N$+$i9=@.$5$l$^$9!#(B
205     </ja:l>
206     </ja:pair>
207     </t>
208    
209     <list style="hanging">
210     <t hangText="(a)"><ja:pair>
211     <ja:l xml:lang="en">
212     the referenced body part's content-type header,
213     </ja:l>
214     <ja:l xml:lang="ja">
215     <ja:word name="referenced body part" />$B$N(B content-type
216     &ja.mail.header;
217     </ja:l>
218     </ja:pair></t>
219     <t hangText="(b)"><ja:pair>
220     <ja:l xml:lang="en">
221     the referring body part's headers except its
222     content-type header,
223     </ja:l>
224     <ja:l xml:lang="ja">
225     <ja:word name="referring body part" />$B$N(B content-type
226     &ja.mail.header;$B0J30$N(B&ja.mail.header;
227     </ja:l>
228     </ja:pair></t>
229     <t hangText="(c)"><ja:pair>
230     <ja:l xml:lang="en">
231     any headers in the referenced body part not in the
232     referring one,
233     </ja:l>
234     <ja:l xml:lang="ja">
235     <ja:word name="referenced body part" />$B$N!"(B<ja:word name="referring body part">$B;2>H$9$kJ}(B</ja:word>$B$K$J$$(B&ja.mail.header;
236     </ja:l>
237     </ja:pair></t>
238     <t hangText="(d)"><ja:pair>
239     <ja:l xml:lang="en">
240     the line separating the headers from the body, and
241     </ja:l>
242     <ja:l xml:lang="ja">
243     &ja.mail.header;$B$H(B&ja.mail.body;$B$r6h@Z$k9T(B
244     </ja:l>
245     </ja:pair></t>
246     <t hangText="(e)"><ja:pair>
247     <ja:l xml:lang="en">
248     the referenced body part's body.
249     </ja:l>
250     <ja:l xml:lang="ja">
251     <ja:word name="referenced body part" />$B$N(B&ja.mail.body;
252     </ja:l>
253     </ja:pair></t>
254     </list><!-- hanging -->
255     </t><!-- additional requirements -->
256     </list><!-- submit form -->
257     </section><!-- 2.1 -->
258    
259     <section title="Example Usage" ja:title-ja="$B;HMQNc(B">
260     <figure>
261     <preamble>
262     <ja:pair>
263     <ja:l xml:lang="en">
264     The following example shows a message that consists of two identical images.
265     </ja:l>
266     <ja:l xml:lang="ja">
267     $B<!$NNc$O!"(B2$B$D$NF1$82hA|$+$i9=@.$5$l$k%a%C%;!<%8$G$9!#(B
268     </ja:l>
269     </ja:pair>
270     </preamble>
271    
272     <ja:pair>
273     <ja:l xml:lang="en">
274    
275    
276     <artwork xml:space="preserve"><![CDATA[ MIME-Version: 1.0
277     Content-Type: Multipart/Mixed;
278     boundary=tiger-lily
279    
280     --tiger-lily
281     Content-Type: image/jpeg
282     Content-ID: <950323.1552@XIson.com>
283    
284     AAAcdb...
285     --tiger-lily
286     Content-type: Message/External-Body;
287     access-type=content-id
288     Content-ID: <950323.1552@XIson.com>
289     Content-Description:
290     This body part is duplicated by reference
291    
292     --tiger-lily--
293     ]]></artwork>
294     </ja:l>
295     <ja:l xml:lang="ja">
296     <artwork xml:space="preserve"><![CDATA[ MIME-Version: 1.0
297     Content-Type: Multipart/Mixed;
298     boundary=tiger-lily
299    
300     --tiger-lily
301     Content-Type: image/jpeg
302     Content-ID: <950323.1552@XIson.com>
303    
304     AAAcdb...
305     --tiger-lily
306     Content-type: Message/External-Body;
307     access-type=content-id
308     Content-ID: <950323.1552@XIson.com>
309     Content-Description:
310     $B$3$N(B&ja.mime.body-part;$B$O;2>H$GJ#@=$5$l$^$9!#(B
311    
312     --tiger-lily--
313     ]]></artwork>
314     </ja:l>
315     </ja:pair>
316     </figure>
317    
318     <figure>
319     <preamble>
320     <ja:pair>
321     <ja:l xml:lang="en">
322     The equivalent MIME entity for the second body part is:
323     </ja:l>
324     <ja:l xml:lang="ja">
325     2$B$D$a$N(B&ja.mime.body-part;$B$HF1Ey$N(B
326     MIME &ja.mime.entity;$B$r<!$K5s$2$^$9!#(B
327     </ja:l>
328     </ja:pair>
329     </preamble>
330    
331     <ja:pair>
332     <ja:l xml:lang="en">
333     <artwork xml:space="preserve"><![CDATA[ --tiger-lily
334     Content-Type: image/jpeg
335     Content-ID: <950323.1552@XIson.com>
336     Content-Description:
337     $B$3$N(B&ja.mime.body-part;$B$O;2>H$GJ#@=$5$l$^$9!#(B
338    
339     AAAcdb...
340     --tiger-lily]]></artwork>
341     </ja:l>
342     <ja:l xml:lang="ja">
343     <artwork xml:space="preserve"><![CDATA[ --tiger-lily
344     Content-Type: image/jpeg
345     Content-ID: <950323.1552@XIson.com>
346     Content-Description:
347     This body part is duplicated by reference
348    
349     AAAcdb...
350     --tiger-lily]]></artwork>
351     </ja:l>
352     </ja:pair>
353     </figure>
354     </section><!-- 2.2 -->
355     </section><!-- 2 -->
356    
357     <section title="Security Considerations">
358     <t>
359     <ja:pair>
360     <ja:l xml:lang="en">
361     The content-id access-type does not impact the security of messages
362     or systems. The referenced MIME entity may have security
363     implications.
364     </ja:l>
365     <ja:l xml:lang="ja">
366     content-id access-type $B$O%a%C%;!<%8$d(B&ja.system;$B$N(B&ja.security;$B$K>W7b$rM?$($^$;$s!#(B<ja:word name="referenced body part">$B;2>H$5$l$?(B
367     MIME &ja.mime.entity;</ja:word>$B$O(B&ja.security;$B$K4X78$9$k$+$b$7$l$^$;$s!#(B
368     </ja:l>
369     </ja:pair>
370     </t>
371     </section>
372    
373     <ja:insert section="references" ja:title-prefix="4. " />
374     <ja:insert section="author-address" ja:title-prefix="5. " />
375     </middle>
376    
377     <back>
378    
379     <references>
380     <reference anchor="RFC822">
381     <front>
382     <title>Standard for the format of ARPA Internet text messages</title>
383     <ja:title xml:lang="ja">ARPA Internet
384     &ja.text;$B%a%C%;!<%8$N=q<0$NI8=`(B</ja:title>
385     <author initials="D." surname="Crocker" fullname="David H. Crocker">
386     <organization abbrev="UDEL">University of Delaware,
387     Dept. of Electrical Engineering</organization>
388     </author>
389     <date month="August" year="1982" />
390     </front>
391     <seriesInfo name="STD" value="11" />
392     <seriesInfo name="RFC" value="822" />
393     </reference>
394    
395     <reference anchor="SGML">
396     <front>
397     <title>Information processing $B!=!=(B Text and office systems
398     $B!=!=(B Standard Generalized Markup Language (SGML)</title>
399     <ja:title xml:lang="ja">$B>pJs=hM}!=!=(B&ja.text;$B5Z$S;vL3=j7OE}!=!=I8=`HFMQ%^!<%/IU$18@8l(B (SGML)</ja:title>
400     </front>
401     <seriesInfo name="ISO" value="8879:1988" />
402     <ja:add-info>
403     <ja:note>$BF|K\9)6H5,3J$G$O!"(B JIS X 4151
404     $B!XJ8=q5-=R8@8l(BSGML$B!Y$,BP1~$7$^$9!#(B
405     ($B;29M(B:
406     <eref target="http://www1.u-netsurf.ne.jp/~7l1rll/SGMLindex.html">JIS X 4151-1992 (ISO 8859:1986 $B$KBP1~(B)</eref>)</ja:note>
407     </ja:add-info>
408     </reference>
409    
410     <reference anchor="MIME">
411     <front>
412     <title>MIME (Multipurpose Internet Mail Extensions)
413     Part One: Mechanisms for Specifying and Describing the Format
414     of Internet Message Bodies</title>
415     <ja:title xml:lang="ja">MIME ($BB?L\E*(B Internet $B%a%$%k3HD%(B)
416     $BBh(B1$BIt(B: Internet $B%a%C%;!<%8K\J8$N=q<0$N;XDj@bL@5!9=(B</ja:title>
417     <author initials="N." surname="Borenstein" fullname="Nathaniel S. Borenstein">
418     <organization>Bellcore</organization>
419     </author>
420     <author initials="N." surname="Freed" fullname="Ned Freed">
421     <organization abbrev="Innosoft">Innosoft International,
422     Inc.</organization>
423     </author>
424     </front>
425     <date month="September" year="1993" />
426     <seriesInfo name="RFC" value="1521" />
427     </reference>
428     </references>
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