[PHP] Re: How to build a XML DTD on "the fly"?

[Erik Franzén]

My real problem is that I am building a XML tree and I want to use the 
getElementbyId method on the tree directly.


It would be very nice if it is possible to do it without including a 
external dtd, since it takes some time to load every time.


The page http://blog.bitflux.ch/wiki/GetElementById_Pitfalls have some 
information about my issue, but I have not found the path to go yet.


I am using php5.05 on Win32.


/Erik



Rob wrote:

Jared Williams wrote:



There is no real standard for creating DTDs on the fly, and therefore 
libxml/DOM doesn't have any methods afaik.


The one method DOMElement::setIDAttribute() should work I think, but 
whilst PHP has the method, doesn’t seem todo anything. :/



DocumentType nodes are read-only in DOM thus cannot be built on the fly. 
Also notice that not all components, such as ATTLIST, even have a node 
type.


setIDAttribute - thats on the TODO list. Were some previous libxml 
issues to be resolved before that could be implemented (so it will be 
added, but require a minimum libxml2 version to work).

Can always use xml:id attributes for that purpose for now though.

Rob



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[PHP] Re: How to build a XML DTD on "the fly"?

[Erik Franzén]

I saw this example on 
http://blog.bitflux.ch/wiki/GetElementById_Pitfalls and thought that I 
could create the DTD in the XML file.


$xml ='
  
  ]>
  

  ';
$dom = new DomDocument();
$dom->loadXML($xml);
print $dom->getElementById('myId')->nodeName;

But apparently, that is not the case.

/Erik


James Benson wrote:

Learn DTD and how it works first then you will know :-)


A DTD is contained in an external file and not in XML, so you would 
create a DTD file then link it from the XML like so,









Erik Franzén wrote:

The code below lacks the part where the folling DTD attribute is 
created: 


How can I create the above DTD attribute in the code below?

createDocumentType('document', null, null);

// Creates a DOMDocument instance
$oDom = $oDomImp->createDocument("", "", $oDomDtd);

// Set other properties
$oDom->encoding = 'iso-8859-1';
$oDom->standalone = true;

// Create an empty element
$oElement = $oDom->createElement('document', 'test');
$oElement->setAttribute('id', '123');
// Append the element
$oDom->appendChild($oElement);

// Retrieve and print the document
echo $oDom->saveXML() . "\n";

echo "TagName: " . $oDom->getElementById('123')->tagName;
?>

Now the code produces the following result:



test

TagName:


Thanks
/Erik





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[PHP] Re: How to build a XML DTD on "the fly"?

[James Benson]

Learn DTD and how it works first then you will know :-)


A DTD is contained in an external file and not in XML, so you would 
create a DTD file then link it from the XML like so,









Erik Franzén wrote:
The code below lacks the part where the folling DTD attribute is 
created: 


How can I create the above DTD attribute in the code below?

createDocumentType('document', null, null);

// Creates a DOMDocument instance
$oDom = $oDomImp->createDocument("", "", $oDomDtd);

// Set other properties
$oDom->encoding = 'iso-8859-1';
$oDom->standalone = true;

// Create an empty element
$oElement = $oDom->createElement('document', 'test');
$oElement->setAttribute('id', '123');
// Append the element
$oDom->appendChild($oElement);

// Retrieve and print the document
echo $oDom->saveXML() . "\n";

echo "TagName: " . $oDom->getElementById('123')->tagName;
?>

Now the code produces the following result:



test

TagName:


Thanks
/Erik


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