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Message-Id: <0eAvi=C0M2U=0U4XZI@thumper.bellcore.com>
Date: Mon,  8 Jun 1992 15:56:59 -0400 (EDT)
From: Darren New <dnew>
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To: Nathaniel Borenstein <nsb>
Subject: Fwd: revised MIME architecture
References: <9206062231.AA23867@pixel.convex.com>

> THIS IS A MESSAGE IN 'MIME' FORMAT.  Your mail reader does not support MIME.
> Please read the first section, which is plain text, and ignore the rest.

--Interpart.Boundary.keAvi9O0M2U=AU4XRw
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I am on the WWW mailing list and got this interesting tidbit of which I
thought you should be aware...
      -- Darren



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To: www-interest@nxoc01.cern.ch
Subject: revised MIME architecture
Mime-Version: 1.0
Content-Type: multipart/mixed;boundary=cut-here
Date: Sat, 06 Jun 92 17:31:58 CDT
From: Dan Connolly <connolly@pixel.convex.com>
Resent-Date:  Mon, 8 Jun 92 18:34:59 GMT
Resent-From: new@ee.udel.edu
Resent-To: dnew@thumper.bellcore.com

In an earlier message, I proposed we make the W3 project
interoperate with MIME systems. I made the mistake
of using existing names for formats and types that
don't yet exist.

I'd like to make a more organized transition to MIME
interoperability.

First, we define some types for existing web servers
and documents.

X-HTTP is an access-type for message/external-body body
parts to access existing W3 servers.
Additional parameters include host, port, path, and anchor.

X-HTML is a subtype of text for existing W3 documents.

So the next part of this message is an HTML document expressed
as a MIME external-body message.


[An Andrew ToolKit view (mailobjv) was included here, but could not be
displayed.]Then we address limitations in the existing format with two
new types:

In order to encapsulate multimedia objects in web nodes,
we define X-HYPERTEXT to be a subtype of the multipart body type.
The first part of a multipart/X-HYPERTEXT is the content of the hypertext.
The other parts are multimedia attachments and links to other documents.

The user agent (WWW client) displays the first part and allows the
user to choose attachments and/or links. The attachments and links
will be displayed in addition to or in place of the original content.

Then, in order to formalize the structure of hypertext parts,
we define X-SGML to be a subtype of text. The body of an X-SGML part must
be a complete SGML document. The user agent (WWW client) will resolve
external entities (such as the DTD and the mutlimedia attachments).

So here's a multimedia web node expressed as MIME body part:


[An Andrew ToolKit view (mailobjv) was included here, but could not be
displayed.]
[An Andrew ToolKit view (mailobjv) was included here, but could not be
displayed.]
[An Andrew ToolKit view (mailobjv) was included here, but could not be
displayed.]And here's the DTD for WEB-NODE documents:

<!-- This DTD was produced by DeveGram on Tue Jun  2 18:58:16 1992 -->
<!-- and hand-edited by connolly@convex.com -->

<!--     Parameter Entities       -->

<!--      Terminal symbols        -->

<!ENTITY % words "#PCDATA" >

<!--    Non-ELEMENT symbols       -->

<!ENTITY % inline	"%words | A" >
<!ENTITY % text         "%inline | P | IMAGE" >
<!ENTITY % heading "H1|H2|H3|H4|H5|H6" >

<!ENTITY lt "<">
<!ENTITY gt ">">
<!ENTITY amp "&">

<!ENTITY lt. "<">
<!ENTITY gt. ">">
<!ENTITY amp. "&">

<!--     Document structure       -->

<!ELEMENT WEB-NODE	O O  (TITLE, NEXTID?, ISINDEX?, section+, ADDRESS?)>

<!ELEMENT TITLE	- -  (%inline)+>
<!ELEMENT ADDRESS - - (%text)+>

<!ELEMENT NEXTID - O EMPTY >
<!ATTLIST NEXTID N NUMBER #IMPLIED>

<!ELEMENT ISINDEX - O EMPTY >


<!ELEMENT section O O ((%heading)?,
			(
			%text |
			section |
			MENU |
			UL |
			OL |
			DIR |
			DL)+)>

<!ELEMENT (H1|H2|H3|H4|H5|H6)	- -  (%inline) >

<!ELEMENT P	- O  EMPTY -- paragraph SEPARATOR -->

<!ELEMENT IMAGE - O  EMPTY>
<!ATTLIST IMAGE ATTACHMENT ENTITY #REQUIRED>

<!ELEMENT A	- -  (%inline)+>
<!ATTLIST A
	NAME CDATA #IMPLIED
	HREF ENTITY #IMPLIED
	TYPE CDATA #IMPLIED --@@-- >

<!ELEMENT MENU	- -  (LI+)>

<!ELEMENT UL	- -  (LI+)>

<!ELEMENT OL	- -  (LI+)>

<!ELEMENT DIR	- -  (LI+)>

<!ELEMENT LI	- O  (%text)+>

<!ELEMENT DL	- -  ((DT, DD)+)>

<!ELEMENT DT	- O  (%inline)+>

<!ELEMENT DD	- O  (%text)+>

And here's a perl script to convert an HTML document
into a multipart/X-HYPERTEXT MIME body part:

#!/usr/local/bin/perl

$boundary = "attachment";
print "Content-Type: multipart/X-HYPERTEXT; boundary=$boundary¥n¥n";

print "--$boundary¥n";
print "Content-Type: text/SGML¥n¥n";

print "<!DOCTYPE WEB-NODE SYSTEM ¥n[¥n";

@html = <>;			# read whole file
$_ = join('', @html);
$out = '';

sub fix_anchor{
    local($name, $href, $type);

    # What exactly is the syntax of an SGML attribute value?
    while(s/^(¥w+)¥s*=¥s*((¥"[^¥"]*¥")|([^¥s>]+))¥s*//){
	local($v) = ($3 || $4);
	local($a) = $1;
	$href = $v if $a =‾ /^href$/i;
	$name = $v if $a =‾ /^name$/i;
	$type = $v if $a =‾ /^type$/i;
    }
    s/[^>]*>//;

    $out .= "<A";
    $out .= " NAME=¥"$name¥"" if $name ne '';
    $out .= " TYPE=¥"$type¥"" if $type ne '';
    if($href ne ''){
	if(!defined($anchor{$href})){
	    $anchor{$href} = ++$anchor;
	}
	$out .= " HREF=" . $anchor{$href};
    }
    $out .= ">";
}

$header = 0;
$anchor = "UDI000";
while(/</){
    $out .= $`;
    $_ = $';
    if(s/^A¥s+//i){
	&fix_anchor;
    }elsif(s/^NEXTID¥s+(¥d+)¥s*>//){
	$out .= "<NEXTID N=$1>";
    }elsif(s/^H(¥d)>//){
	local($n) = $1;
	while($n<=$header){ $out .= "</SECTION>"; $header--; }
	while($n>$header){ $out .= "<SECTION>"; $header++; }
	$out .= "<H$n>";
    }else{
	$out .= '<';
    }
}

$out .= $_;

foreach(keys %anchor){
    local($ent) = $anchor{$_};

    print "<!ENTITY $ent SDATA ¥"$_¥">¥n";
}

print "]>¥n", $out;

foreach(keys %anchor){
    local($access_type);

    print "¥n¥n--$boundary¥n";
    print "Content-id: $_¥n";
    print "Content-type: message/external-body¥n";

    $access_type = $1 if s/^(¥w+)://;

    if(s/#([^#]+)$//){
	print "¥t;x-anchor=¥"$1¥"¥n";
    }

    if($access_type =‾ /file/i){
	if(&hostport){
	    &param('access-type', "ANON-FTP");
	}else{
	    &param('access-type', 'LOCAL-FILE');
	}
	&param('name', $_);

	print "¥nContent-Type: application/octet-stream¥n¥n";
    }elsif($access_type =‾ /http/i){
	&param('access-type', 'X-HTTP');
	&hostport;
	&unescape;
	&param('name', $_);

	print "¥nContent-Type: text/X-HTML¥n¥n";
    }elsif($access_type =‾ /news/i){
	&param('access-type', 'X-NEWS');
	&unescape;
	if(/@/){
	    &param('message-id', $_);
	}else{
	    &param('group', $_);
	}

	print "¥nContent-Type: message¥n¥n";

    }elsif($access_type =‾ /telnet/i){
	&param('access-type', 'x-telnet');
	&unescape;
	&param('user', $1) if s/^(.*)@//;
	&param('port', $1) if s/:(.*)$//;
	&param('site', $_);

	print "¥nContent-Type: X-TELNET¥n¥n";

    }elsif($access_type =‾ /gopher/i){
	&param('access-type', 'x-gopher');
	&hostport;
	&param('type', $1) if s-^/(¥d+)/--;
	&unescape;
	&param('selector', $_);

	print "¥nContent-Type: @@@@¥n¥n";

    }elsif($access_type =‾ /wais/i){
	&param('access-type', 'x-wais');
	&hostport;
	if(m-^/-){
	    &param('type', $1) if s-^/(¥w+)--;
	    &param('size', $1) if s-^/(¥d+)--;
	    &unescape;
	    &param('path', $_);
	}else{
	    &unescape;
	    &param('words', $1) if /¥?(.*)/;
	}

	$type = "image/$type" if $type =‾ /gif|tiff/i;
	$type = "application/postscript" if $type =‾ /PS/i;

	print "¥nContent-Type: $type¥n¥n";

    }elsif($access_type eq ""){
	&param('access-type', 'x-relative');
	&unescape;
	&param('name', $_);

	print "¥nContent-Type: message¥n¥n";
    }else{
	warn "unknown access type: $access_type in $_";
    }
}

print "--$boundary--¥n";

sub unescape{
    s/%(¥w¥w)/sprintf("%c",hex($1))/ge;
}

sub param{
    local($p, $v) = @_;
    # quote tspecials in parameter values
    $v = '"'.$v.'"' if $v =‾ m-[¥s()<>@,;:¥¥¥"¥/¥[¥]?¥.=]-;
    print "¥t;$p=$v¥n";
}

sub hostport{
    if(s-//([^:/]+)--){
	&param('host', $1);
	&param('port', $1)  if s/:(¥d+)//;
	1;
    }else{
	0;
    }
}


--Interpart.Boundary.keAvi9O0M2U=AU4XRw
Content-Type: multipart/mixed; 
	boundary="Alternative.Boundary.keAvi9O0M2U=8U4XMt"

--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: text/richtext; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

<nl>
I am on the WWW mailing list and got this interesting tidbit of which I though=
t you should be aware...<nl>
      -- Darren<nl>
<nl>
<nl>
<smaller><nl>
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	id AA23867; Sat, 6 Jun 92 17:31:59 -0500<nl>
Message-Id: <lt>9206062231.AA23867@pixel.convex.com><nl>
To: www-interest@nxoc01.cern.ch<nl>
Subject: revised MIME architecture<nl>
Mime-Version: 1.0<nl>
Content-Type: multipart/mixed;boundary=3Dcut-here<nl>
Date: Sat, 06 Jun 92 17:31:58 CDT<nl>
From: Dan Connolly <lt>connolly@pixel.convex.com><nl>
Resent-Date:  Mon, 8 Jun 92 18:34:59 GMT<nl>
Resent-From: new@ee.udel.edu<nl>
Resent-To: dnew@thumper.bellcore.com</smaller><nl>
<nl>
In an earlier message, I proposed we make the W3 project<nl>
interoperate with MIME systems. I made the mistake<nl>
of using existing names for formats and types that<nl>
don't yet exist.<nl>
<nl>
I'd like to make a more organized transition to MIME<nl>
interoperability.<nl>
<nl>
First, we define some types for existing web servers<nl>
and documents.<nl>
<nl>
X-HTTP is an access-type for message/external-body body<nl>
parts to access existing W3 servers.<nl>
Additional parameters include host, port, path, and anchor.<nl>
<nl>
X-HTML is a subtype of text for existing W3 documents.<nl>
<nl>
So the next part of this message is an HTML document expressed<nl>
as a MIME external-body message.<nl>
<nl>
<nl>

--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: message/external-body;
	access-type="X-HTTP";
	host="info.cern.ch";
	port="2784";
	path="/hypertext/WWW/TheProject.html"
Content-Description: Object of type 'message/external-body;

Content-type: text/X-HTML




--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: text/richtext; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

<nl>
Then we address limitations in the existing format with two<nl>
new types:<nl>
<nl>
In order to encapsulate multimedia objects in web nodes,<nl>
we define X-HYPERTEXT to be a subtype of the multipart body type.<nl>
The first part of a multipart/X-HYPERTEXT is the content of the hypertext.<nl>=

The other parts are multimedia attachments and links to other documents.<nl>
<nl>
The user agent (WWW client) displays the first part and allows the<nl>
user to choose attachments and/or links. The attachments and links<nl>
will be displayed in addition to or in place of the original content.<nl>
<nl>
Then, in order to formalize the structure of hypertext parts,<nl>
we define X-SGML to be a subtype of text. The body of an X-SGML part must<nl>
be a complete SGML document. The user agent (WWW client) will resolve<nl>
external entities (such as the DTD and the mutlimedia attachments).<nl>
<nl>
So here's a multimedia web node expressed as MIME body part:<nl>
<nl>
<nl>

--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: text/SGML
Content-Description: Object of type 'text/SGML
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE WEB-NODE SYSTEM
[
<!ENTITY UDI001 SDATA "HTTP://info.cern.ch/hypertext/WWW/TheProject.html"=
>
<!ENTITY part3 SDATA "part3">
]>
<TITLE>Sample mutlimedia web node</TITLE>
<SECTION><H1>Old features</H1>
Here's a link to some info at cern:
 <A HREF=3DUDI001>cern stuff</A>
<SECTION><H2>New features</H2>
Here's a picture: <IMAGE ATTACHMENT=3Dpart3>




--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: text/richtext; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

<nl>
<nl>

--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: message/external-body 	;
	access-type="X-HTTP 	";
	host="info.cern.ch";
	name="/hypertext/WWW/TheProject.html"
Content-Description: Object of type 'message/external-body

Content-Type: text/X-HTML



--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: text/richtext; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

<nl>
<nl>

--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: image/gif
Content-Description: Object of type 'image/gif
Content-Transfer-Encoding: base64

R0lGODdhdQAvAIQAAL9/v3+ff39/f/+/f/+ff/9/f3+fv///v39/v//fv/+/v/+fv/9/v7+/
f7+ff79/f//////f/7/fv7+/v7+fvwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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--Alternative.Boundary.keAvi9O0M2U=8U4XMt
Content-type: text/richtext; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

<nl>
And here's the DTD for WEB-NODE documents:<nl>
<nl>
<lt>!-- This DTD was produced by DeveGram on Tue Jun  2 18:58:16 1992 --><nl>
<lt>!-- and hand-edited by connolly@convex.com --><nl>
<nl>
<lt>!--     Parameter Entities       --><nl>
<nl>
<lt>!--      Terminal symbols        --><nl>
<nl>
<lt>!ENTITY % words "#PCDATA" ><nl>
<nl>
<lt>!--    Non-ELEMENT symbols       --><nl>
<nl>
<lt>!ENTITY % inline	"%words | A" ><nl>
<lt>!ENTITY % text         "%inline | P | IMAGE" ><nl>
<lt>!ENTITY % heading "H1|H2|H3|H4|H5|H6" ><nl>
<nl>
<lt>!ENTITY lt "<lt>"><nl>
<lt>!ENTITY gt ">"><nl>
<lt>!ENTITY amp "&"><nl>
<nl>
<lt>!ENTITY lt. "<lt>"><nl>
<lt>!ENTITY gt. ">"><nl>
<lt>!ENTITY amp. "&"><nl>
<nl>
<lt>!--     Document structure       --><nl>
<nl>
<lt>!ELEMENT WEB-NODE	O O  (TITLE, NEXTID?, ISINDEX?, section+, ADDRESS?)><nl>=

<nl>
<lt>!ELEMENT TITLE	- -  (%inline)+><nl>
<lt>!ELEMENT ADDRESS - - (%text)+><nl>
<nl>
<lt>!ELEMENT NEXTID - O EMPTY ><nl>
<lt>!ATTLIST NEXTID N NUMBER #IMPLIED><nl>
<nl>
<lt>!ELEMENT ISINDEX - O EMPTY ><nl>
<nl>
<nl>
<lt>!ELEMENT section O O ((%heading)?,<nl>
			(<nl>
			%text |<nl>
			section |<nl>
			MENU |<nl>
			UL |<nl>
			OL |<nl>
			DIR |<nl>
			DL)+)><nl>
<nl>
<lt>!ELEMENT (H1|H2|H3|H4|H5|H6)	- -  (%inline) ><nl>
<nl>
<lt>!ELEMENT P	- O  EMPTY -- paragraph SEPARATOR --><nl>
<nl>
<lt>!ELEMENT IMAGE - O  EMPTY><nl>
<lt>!ATTLIST IMAGE ATTACHMENT ENTITY #REQUIRED><nl>
<nl>
<lt>!ELEMENT A	- -  (%inline)+><nl>
<lt>!ATTLIST A<nl>
	NAME CDATA #IMPLIED<nl>
	HREF ENTITY #IMPLIED<nl>
	TYPE CDATA #IMPLIED --@@-- ><nl>
<nl>
<lt>!ELEMENT MENU	- -  (LI+)><nl>
<nl>
<lt>!ELEMENT UL	- -  (LI+)><nl>
<nl>
<lt>!ELEMENT OL	- -  (LI+)><nl>
<nl>
<lt>!ELEMENT DIR	- -  (LI+)><nl>
<nl>
<lt>!ELEMENT LI	- O  (%text)+><nl>
<nl>
<lt>!ELEMENT DL	- -  ((DT, DD)+)><nl>
<nl>
<lt>!ELEMENT DT	- O  (%inline)+><nl>
<nl>
<lt>!ELEMENT DD	- O  (%text)+><nl>
<nl>
And here's a perl script to convert an HTML document<nl>
into a multipart/X-HYPERTEXT MIME body part:<nl>
<nl>
#!/usr/local/bin/perl<nl>
<nl>
$boundary =3D "attachment";<nl>
print "Content-Type: multipart/X-HYPERTEXT; boundary=3D$boundary¥n¥n";<nl>
<nl>
print "--$boundary¥n";<nl>
print "Content-Type: text/SGML¥n¥n";<nl>
<nl>
print "<lt>!DOCTYPE WEB-NODE SYSTEM ¥n[¥n";<nl>
<nl>
@html =3D <lt>>;			# read whole file<nl>
$_ =3D join('', @html);<nl>
$out =3D '';<nl>
<nl>
sub fix_anchor{<nl>
    local($name, $href, $type);<nl>
<nl>
    # What exactly is the syntax of an SGML attribute value?<nl>
    while(s/^(¥w+)¥s*=3D¥s*((¥"[^¥"]*¥")|([^¥s>]+))¥s*//){<nl>
	local($v) =3D ($3 || $4);<nl>
	local($a) =3D $1;<nl>
	$href =3D $v if $a =3D‾ /^href$/i;<nl>
	$name =3D $v if $a =3D‾ /^name$/i;<nl>
	$type =3D $v if $a =3D‾ /^type$/i;<nl>
    }<nl>
    s/[^>]*>//;<nl>
<nl>
    $out .=3D "<lt>A";<nl>
    $out .=3D " NAME=3D¥"$name¥"" if $name ne '';<nl>
    $out .=3D " TYPE=3D¥"$type¥"" if $type ne '';<nl>
    if($href ne ''){<nl>
	if(!defined($anchor{$href})){<nl>
	    $anchor{$href} =3D ++$anchor;<nl>
	}<nl>
	$out .=3D " HREF=3D" . $anchor{$href};<nl>
    }<nl>
    $out .=3D ">";<nl>
}<nl>
<nl>
$header =3D 0;<nl>
$anchor =3D "UDI000";<nl>
while(/<lt>/){<nl>
    $out .=3D $`;<nl>
    $_ =3D $';<nl>
    if(s/^A¥s+//i){<nl>
	&fix_anchor;<nl>
    }elsif(s/^NEXTID¥s+(¥d+)¥s*>//){<nl>
	$out .=3D "<lt>NEXTID N=3D$1>";<nl>
    }elsif(s/^H(¥d)>//){<nl>
	local($n) =3D $1;<nl>
	while($n<lt>=3D$header){ $out .=3D "<lt>/SECTION>"; $header--; }<nl>
	while($n>$header){ $out .=3D "<lt>SECTION>"; $header++; }<nl>
	$out .=3D "<lt>H$n>";<nl>
    }else{<nl>
	$out .=3D '<lt>';<nl>
    }<nl>
}<nl>
<nl>
$out .=3D $_;<nl>
<nl>
foreach(keys %anchor){<nl>
    local($ent) =3D $anchor{$_};<nl>
<nl>
    print "<lt>!ENTITY $ent SDATA ¥"$_¥">¥n";<nl>
}<nl>
<nl>
print "]>¥n", $out;<nl>
<nl>
foreach(keys %anchor){<nl>
    local($access_type);<nl>
<nl>
    print "¥n¥n--$boundary¥n";<nl>
    print "Content-id: $_¥n";<nl>
    print "Content-type: message/external-body¥n";<nl>
<nl>
    $access_type =3D $1 if s/^(¥w+)://;<nl>
<nl>
    if(s/#([^#]+)$//){<nl>
	print "¥t;x-anchor=3D¥"$1¥"¥n";<nl>
    }<nl>
<nl>
    if($access_type =3D‾ /file/i){<nl>
	if(&hostport){<nl>
	    &param('access-type', "ANON-FTP");<nl>
	}else{<nl>
	    &param('access-type', 'LOCAL-FILE');<nl>
	}<nl>
	&param('name', $_);<nl>
<nl>
	print "¥nContent-Type: application/octet-stream¥n¥n";<nl>
    }elsif($access_type =3D‾ /http/i){<nl>
	&param('access-type', 'X-HTTP');<nl>
	&hostport;<nl>
	&unescape;<nl>
	&param('name', $_);<nl>
<nl>
	print "¥nContent-Type: text/X-HTML¥n¥n";<nl>
    }elsif($access_type =3D‾ /news/i){<nl>
	&param('access-type', 'X-NEWS');<nl>
	&unescape;<nl>
	if(/@/){<nl>
	    &param('message-id', $_);<nl>
	}else{<nl>
	    &param('group', $_);<nl>
	}<nl>
<nl>
	print "¥nContent-Type: message¥n¥n";<nl>
<nl>
    }elsif($access_type =3D‾ /telnet/i){<nl>
	&param('access-type', 'x-telnet');<nl>
	&unescape;<nl>
	&param('user', $1) if s/^(.*)@//;<nl>
	&param('port', $1) if s/:(.*)$//;<nl>
	&param('site', $_);<nl>
<nl>
	print "¥nContent-Type: X-TELNET¥n¥n";<nl>
<nl>
    }elsif($access_type =3D‾ /gopher/i){<nl>
	&param('access-type', 'x-gopher');<nl>
	&hostport;<nl>
	&param('type', $1) if s-^/(¥d+)/--;<nl>
	&unescape;<nl>
	&param('selector', $_);<nl>
<nl>
	print "¥nContent-Type: @@@@¥n¥n";<nl>
<nl>
    }elsif($access_type =3D‾ /wais/i){<nl>
	&param('access-type', 'x-wais');<nl>
	&hostport;<nl>
	if(m-^/-){<nl>
	    &param('type', $1) if s-^/(¥w+)--;<nl>
	    &param('size', $1) if s-^/(¥d+)--;<nl>
	    &unescape;<nl>
	    &param('path', $_);<nl>
	}else{<nl>
	    &unescape;<nl>
	    &param('words', $1) if /¥?(.*)/;<nl>
	}<nl>
<nl>
	$type =3D "image/$type" if $type =3D‾ /gif|tiff/i;<nl>
	$type =3D "application/postscript" if $type =3D‾ /PS/i;<nl>
<nl>
	print "¥nContent-Type: $type¥n¥n";<nl>
<nl>
    }elsif($access_type eq ""){<nl>
	&param('access-type', 'x-relative');<nl>
	&unescape;<nl>
	&param('name', $_);<nl>
<nl>
	print "¥nContent-Type: message¥n¥n";<nl>
    }else{<nl>
	warn "unknown access type: $access_type in $_";<nl>
    }<nl>
}<nl>
<nl>
print "--$boundary--¥n";<nl>
<nl>
sub unescape{<nl>
    s/%(¥w¥w)/sprintf("%c",hex($1))/ge;<nl>
}<nl>
<nl>
sub param{<nl>
    local($p, $v) =3D @_;<nl>
    # quote tspecials in parameter values<nl>
    $v =3D '"'.$v.'"' if $v =3D‾ m-[¥s()<lt>>@,;:¥¥¥"¥/¥[¥]?¥.=3D]-;<nl>
    print "¥t;$p=3D$v¥n";<nl>
}<nl>
<nl>
sub hostport{<nl>
    if(s-//([^:/]+)--){<nl>
	&param('host', $1);<nl>
	&param('port', $1)  if s/:(¥d+)//;<nl>
	1;<nl>
    }else{<nl>
	0;<nl>
    }<nl>
}<nl>
<nl>

--Alternative.Boundary.keAvi9O0M2U=8U4XMt--

--Interpart.Boundary.keAvi9O0M2U=AU4XRw--