- From: Jacob Palme <jpalme@dsv.su.se>
- Date: Thu, 4 Sep 1997 14:19:14 +0100
- To: mhtml@SEGATE.SUNET.SE
- Cc: uri@bunyip.com
At 00.08 -0500 97-09-04, Pete Resnick wrote: > Content-Type: multipart/related > Content-Base: foo://bar/biff/ > > Content-Type: multipart/mixed > Content-Location: blah://blee/blue.bar > > Content-Type: text/html > > What is the base for the text/html, which has neither Content-Location nor > Content-Base? Is it <blah://blee/> (the base we use for its parent since it > has not Content-Base) or is it <foo://bar/biff/> (the specific base of its > parent's parent)? The latest draft says that a base in an absolute Content-Location in an inner heading has precedence over a Content-Base in a heading further out. Below is the text in the draft I sent in a few days ago (ftp://ftp.dsv.su.se/users/jpalme/draft-ietf-mhtml-rev-01.txt, see also http://www.dsv.su.se/~jpalme/ietf/mhtml.html): --- --- 5. Base URIs for resolution of relative URIs Relative URIs inside contents of MIME body parts are resolved relative to a base URI using the methods for resolving relative URIs described in [RELURL]. In order to determine this base URI, the first-applicable method in the following list applies. (a) There is a base specification inside the MIME body part containing the link which resolves relative URIs into absolute URIs. For example, HTML provides the BASE element for this. (b) There is a Content-Base header (as defined in section 4.2), in the immediately surrounding content heading, specifying the base to be used. (c) There is a Content-Location header in the immediately surrounding heading of the body part which contains an absolute URI and can then serve as the base in the same way as the requested URI can serve as a base for relative URIs within a file retrieved via HTTP [HTTP]. (d) Step (b) and (c) can be repeated recursively on Content-Base and Content-Location headers in surrounding multi-part headings. However, a base from an absolute Content-Location in an inner heading takes precedence over a base from a Content-Base or a Content-Location in a surrounding heading. When the methods above do not yield an absolute URI matching of two relative URIs against each other can still be done for matches within a multipart/related. This matching is done as if they had been given as base an imaginary URL "This_message:/", which exists for the sole purpose of resolving relative references within a multipart entitity. ------------------------------------------------------------------------ Jacob Palme <jpalme@dsv.su.se> (Stockholm University and KTH) for more info see URL: http://www.dsv.su.se/~jpalme
Received on Thursday, 4 September 1997 08:16:55 UTC