Description:
------------
A lot of php functions that read xml try to validate that the uri exsist, which is wrong by w3.org.

If the xmlns uri is not valid the functions don't work at all.

Functions tried: 
SimpleXMLElement()
DOMDocument->loadHTMLFile()

I am opening this after opening a problem with w3.org which create the problematic xml, they realied the fallowing:

http://www.w3.org/2005/10/markup-validator is a namespace URI, and there is no
requirement for it to actually point to anything - it's just an identifier.  If
something makes an assumption that it can retrieve anything at all from a
namespace URI, it needs to be fixed not to assume that, let alone try it
automatically.

http://www.w3.org/TR/xml-names/
http://www.rpbourret.com/xml/NamespacesFAQ.htm#q12_3




Reproduce code:
---------------
a.xml

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope">
<env:Body>
<m:markupvalidationresponse env:encodingStyle="http://www.w3.org/2003/05/soap-encoding" xmlns:m="http://www.w3.org/2005/10/soap-encoding">
    <m:uri>http://www.microsoft.com/en/us/default.aspx</m:uri>
    <m:checkedby>http://validator.w3.org/</m:checkedby>
    <m:doctype>-//W3C//DTD HTML 4.0 Transitional//EN</m:doctype>
    <m:charset>utf-8</m:charset>
    <m:validity>false</m:validity>
    <m:errors>
        <m:errorcount>5</m:errorcount>
        <m:errorlist>
          
            <m:error>
                <m:line>1</m:line>
                <m:col>6012</m:col>                                           
                <m:message>there is no attribute &quot;TABINDEX&quot;</m:message>
            </m:error>
           
            <m:error>
                <m:line>1</m:line>
                <m:col>6116</m:col>                                           
                <m:message>document type does not allow element &quot;DIV&quot; here; missing one of &quot;APPLET&quot;, &quot;OBJECT&quot;, &quot;MAP&quot;, &quot;IFRAME&quot;, &quot;BUTTON&quot; start-tag</m:message>
            </m:error>
           
            <m:error>
                <m:line>1</m:line>
                <m:col>6154</m:col>                                           
                <m:message>document type does not allow element &quot;DIV&quot; here; missing one of &quot;APPLET&quot;, &quot;OBJECT&quot;, &quot;MAP&quot;, &quot;IFRAME&quot;, &quot;BUTTON&quot; start-tag</m:message>
            </m:error>
           
            <m:error>
                <m:line>1</m:line>
                <m:col>9671</m:col>                                           
                <m:message>there is no attribute &quot;TABINDEX&quot;</m:message>
            </m:error>
           
            <m:error>
                <m:line>1</m:line>
                <m:col>9744</m:col>                                           
                <m:message>there is no attribute &quot;ONFOCUS&quot;</m:message>
            </m:error>
           
        </m:errorlist>
    </m:errors>
    <m:warnings>
        <m:warningcount>0</m:warningcount>
        <m:warninglist>
        
        
        </m:warninglist>
    </m:warnings>
</m:markupvalidationresponse>
</env:Body>
</env:Envelope>


$uri ='c:\a.xml';

$handle = fopen($uri, "r");

$contents = '';
while (!feof($handle)) {
  $contents .= fread($handle, 8192);
}
fclose($handle);

//echo $contents;

$entries = new  SimpleXMLElement($contents);

$result= $entries->children('http://www.w3.org/2003/05/soap-envelope')->Body->children('http://www.w3.org/2003/05/soap-encoding')->markupvalidationresponse;
echo $result->uri ;

Expected result:
----------------
expected to put on screen
http://www.microsoft.com/en/us/default.aspx

Actual result:
--------------
Nothing is put on screen.

if you change a.xml line
<m:markupvalidationresponse env:encodingStyle="http://www.w3.org/2003/05/soap-encoding" xmlns:m="http://www.w3.org/2005/10/soap-encoding">

xmlns:m= uri to anything that validates this works 
example
<m:markupvalidationresponse env:encodingStyle="http://www.w3.org/2003/05/soap-encoding" xmlns:m="http://www.w3.org/2003/05/soap-encoding">