Rob, please take a look

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Don't know about GRDDL, but for DOM trees, base uri of a DOMDocument is 
the URI its loaded from (or for memory based tree, the current dir).
You need to check on the document element to get the base uri you are 
looking for.

See http://www.w3.org/TR/grddl/#base_misc & http://www.apps.ietf.org/rfc/rfc3986.html#sec-5.1

The way to determine baseURI is:
 1. Look for it on the root document element (HTML - <base>, XML - <foo xml:base="">
 2. Couldn't find that? Use the URL we retrieved the document with
     * And make sure we follow redirects!
 3. Couldn't find that? Application specific (but we don't really have a setBaseURI())

So, condition #1 is broken in 5.2.5 when you do:

<?php
$doc =
DOMDocument::load('http://www.w3.org/2001/sw/grddl-wg/td/inline-rdf6.xml');
var_dump($doc->baseURI);    //Expected http://wwww.example.org/

produces:
string(53) "http://www.w3.org/2001/sw/grddl-wg/td/inline-rdf6.xml"

still bogus as what you are describing pertains to GRDDL only not DOM, 
so when working with GRDDL and DOm you need to check base uri of the 
document element, not the DOMDocument.
DOM determines base uri using the xml base spec.

"The base URI of a document entity or an external entity is determined 
by RFC 2396 rules, namely, that the base URI is the URI used to retrieve 
the document entity or external entity."

This is not just how it is implemented in PHP as the other major DOM 
parsers implement it the same way,

:S I hate being pushy / argumentitive, sorry if its coming across that way.


RFC 2396 is "Uniform Resource Identifiers (URI): Generic Syntax"

Section 5.1. is "Establishing a Base URI" describes what I've been trying to say, probably a little clearer.



XML Base spec @ http://www.w3.org/TR/xmlbase/#rfc2396 says:

Determine a baseURI:
 1. The base URI is embedded in the document's content.
 2. The base URI is that of the encapsulating entity (message, document, or none).
 3. The base URI is the URI used to retrieve the entity.
 4. The base URI is defined by the context of the application.




> This is not just how it is implemented in PHP as the other major DOM parsers implement it the same way

... and that's why the xml:base GRDDL tests were written - to clarify correct behaviour / check implementations.

A test case which illustrates that the baseURI parsing is working correctly now (at least in PHP 5.3.15):

<?php
$doc = DOMDocument::load('http://www.w3.org/2001/sw/grddl-wg/td/inline-rdf6.xml');

var_dump($doc->baseURI); // "http://www.w3.org/2001/sw/grddl-wg/td/inline-rdf6.xml"

var_dump($doc->documentElement->baseURI); // "http://wwww.example.org/"

As http://www.w3.org/TR/xmlbase/ describes, the base URI of a document entity is the URI used to retrieve the document entity. The base URI of an element (including the document element) is 
detected by various rules, starting with the xml:base attribute on the element.

Please take care that PHP's DOMDocument does not offer the DOM CORE Level 3 
feature at all. So whatever the specs of that DOM Core Level say, nothing - 
absolutely nothing - allows to draw the conclusion that this (perhaps by accident 
same named property) is an implementation of DOM Core Level 3.

PHP's DOMDocument has only DOM Core Level 1 feature which does not cover this 
property.

All references to XML Infoset in this ticket are therefore completely bogus.

I submitted a couple of related feature requests:

Request #65364 - In doc not loaded from a URL, baseURI should still be a real URI
Request #65365 - Allow defining baseURI of doc not loaded directly from URL