SimpleXML - add a new node using a namespace previously declared - how ?

Question

Hello all,

<epp>
    <domain:create xmlns:domain="urn:someurn">
       <domain:name></domain:name>
       <domain:registrant></domain:registrant>
       <domain:contact></domain:contact>
    </domain:create>
</epp>

I would like to add a child, on a very specific place (so I'm also using DOM and not only simpleXML) for <domain:create> node.

I have tried to use the $ns attribute on simpleXML construct.

$nsNode = new SimpleXMLElement('<domain:ns>', $options = 0, $ns='urn:ietf:params:xml:ns:domain-1.0');

//transform the target into dom object for manipulation
$nodeRegistrantDom = dom_import_simplexml($nodeRegistrant);

But I'm getting:

I/O warning : failed to load external entity "<domain:ns>"

I've tried to register the prefix after creating the element, but I use no xpath after this, so this was quite a useless try...

//creates the simpleXML object node to be inserted.
$nsNode = new SimpleXMLElement('<ns/>');

//this will not work, because we will not use xpath after it :s
$nsNode->registerXPathNamespace('domain', 'urn:ietf:params:xml:ns:domain-1.0');

Since the xml is loaded from a file, and that file as this ns declared, maybe we should grab it from that file?

Here is an overall of the above, so that we can better understand the context: We are loading a XML file that contains an overall structure:

 $xmlObj = simplexml_load_file('EppCreateDomain.xml');

They we will grab an element that we will use as a target:

//grab the target.
    $nodeRegistrant = $xmlObj->command->create->children(self::OBJ_URI_DOMAIN)->create->registrant;

    //transform the target into a dom object for later manipulation
    $nodeRegistrantDom = dom_import_simplexml($nodeRegistrant);

//we try to use simpleXML to create the node that we want to add after our target.
    $nsNode = new SimpleXMLElement('<domain:ns>');


//grabs the node and all his children (none in this case), by importing the node we want to add,
//into the root object element that contains the <domain:registrant> node.
$nsNodeDom = $nodeRegistrantDom->ownerDocument->importNode(dom_import_simplexml($nsNode), true);

$nodeRegistrantDom->parentNode->insertBefore($nsNodeDom, $nodeRegistrantDom->nextSibling);

$simpleXmlNsNode = simplexml_import_dom($nsNodeDom);

Now we have our node placed on a proper place. And converted to simpleXML so, we can now easily add some children and fill the rest of the xml file..

$hostAttr = $simpleXmlNsNode->addChild('domain:hostAttr');
$hostName = $hostAttr->addChild('domain:hostName');

Please advice, MEM

Answer 1

Since the xml is loaded from a file, and that file as this ns declared, maybe we should grab it from that file?

If that file is a XML file, yes, you should load the whole the file, not just a portion.

Once the namespace is declared, adding a namespaced element is easy:

<?php
$xml = <<<XML
<epp>
    <domain:create xmlns:domain="urn:someurn" xmlns:ietf="urn:thaturn">
       <domain:name></domain:name>
       <domain:registrant></domain:registrant>
       <domain:contact></domain:contact>
    </domain:create>
</epp>
XML;

$sxml = new SimpleXMLElement($xml);
$sxml->children("domain", true)->create->addChild("newElem", "value", "urn:thaturn");
echo $sxml->saveXML();

gives

<?xml version="1.0"?>
<epp>
    <domain:create xmlns:domain="urn:someurn" xmlns:ietf="urn:thaturn">
       <domain:name/>
       <domain:registrant/>
       <domain:contact/>
    <ietf:newElem>value</ietf:newElem></domain:create>
</epp>

Answer 2

<?php
// test document, registrant as first/last element and somewhere in between
$xmlObj = new SimpleXMLElement('<epp>
  <domain:create xmlns:domain="urn:someurn">
    <domain:name></domain:name>
    <domain:registrant></domain:registrant>
    <domain:contact></domain:contact>
  </domain:create>
  <domain:create xmlns:domain="urn:someurn">
    <domain:name></domain:name>
    <domain:contact></domain:contact>
    <domain:registrant></domain:registrant>
  </domain:create>
  <domain:create xmlns:domain="urn:someurn">
    <domain:registrant></domain:registrant>
    <domain:name></domain:name>
    <domain:contact></domain:contact>
  </domain:create>
</epp>');

foreach( $xmlObj->children("urn:someurn")->create as $create ) {
  $registrant = $create->registrant;
  insertAfter($registrant, 'domain:ns', 'some text');
}
echo $xmlObj->asXML();

function insertAfter(SimpleXMLElement $prevSibling, $qname, $val) {
  $sd = dom_import_simplexml($prevSibling);
  $newNode = $sd->ownerDocument->createElement($qname, $val);
  $newNode = $sd->parentNode->insertBefore($newNode, $sd->nextSibling);
  return simplexml_import_dom($newNode);
}

prints

<?xml version="1.0"?>
<epp>
  <domain:create xmlns:domain="urn:someurn">
    <domain:name/>
    <domain:registrant/><domain:ns>some text</domain:ns>
    <domain:contact/>
  </domain:create>
  <domain:create xmlns:domain="urn:someurn">
    <domain:name/>
    <domain:contact/>
    <domain:registrant/><domain:ns>some text</domain:ns>
  </domain:create>
  <domain:create xmlns:domain="urn:someurn">
    <domain:registrant/><domain:ns>some text</domain:ns>
    <domain:name/>
    <domain:contact/>
  </domain:create>
</epp>