XML Closing Tags

My View Source is showing the current XML. However, I am still getting an error from the web service. Is there anything else that I am overlooking?

Are you declaring your xml document as standards are requiring?

<?xml version="1.0"?>

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... it has ignored the closing tag ...

What is "it" in that statement?  How exactly are you constructing the XML document?

It is the generated source.

The web service does not require the <?xml ... tag.

I am constructing xml in a php variable which is then passed to the web method.

$param = '<tag1>';
$param .= .....

I am constructing xml in the same fashion for another web method from the same web service provider and it works flawlessly.

Try to construct the variable with double quotes instead of single quotes.

Single quotes could mess up new lines (eol).

I believe I tried that but will try it again. Thanks

I want to deconstruct this a little bit (copied from the original question).  How does this happen?  What process is changing the XML document (the becomes verb)?  These documents are not very much alike at all - in meaning or content.

For example,
<tag1>
    <tag2>Some Value</tag2>
    <tag3 isNull="false" />
   <tag4>Some other Value</tag4>
</tag1>
becomes
<tag1>
    <tag2>Some Value</tag2>
    <tag3 isNull="false">
   <tag4>Some other Value</tag4>
    </tag3>
    <tag3 isNull="false"></tag3>
</tag1>

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View Source in Firefox shows the correct XML. View Generated Source in Firefox shows the incorrect XML.

Thank you Ray for the visualization

That sounds like the problem might be in Firefox.  If your program code is creating a valid XML document, it doesn't seem like FF is rendering it correctly with View Generated Source.

I sent the XML using the WCFStorm tool and I get a successful response.

I took the exact same XML and sent it via PHP and I get the "Object reference not set to anything" error.
$arg = 'XML sent using WCFStorm tool';
$c->call('Method Name', $arg);
I am using nusoapclient and Zend

Sorry -- if it's SOAP I have to sign off.  Nothing personal, but SOAP is an impossibly bad protocol, and now that I know it's SOAP, I can accept any outcome, no matter how ridiculous, as plausible.  Ask the publishers if they have a RESTful interface and use if it they do.  It will most likely work correctly and intuitively the first time.  If they do not have a REST interface, ask them for a PHP example using SOAP.  I wish I could be of some help, but life is too short to use and debug SOAP.  It's like being a blind man in a knife fight.

They don't have a RESTful interface. I am required to use SOAP. Can someone help?

Please ignore the delete request. I have accepted 2 answers as solutions.