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Subject: Re: [PHP-DEV] Re: Question on XMLReader
From: jstokes@heartofthefyre.us (John Stokes)

UPDATE: I figured out number 2. Maybe I had an extra text node in there, 
but now it's working.

Can someone help with the others?

-John

On 9/26/2013 8:12 PM, John Stokes wrote:
> Well, fine then.
>
> I'm trying to understand the mechanics behind XMLReader::next() and 
> XMLReader::read()
>
> Given an XML file like this:
> $library = '
> <?xml version="1.0"?>
> <library>
>     <book>
>         <title>Of Mice and Men</title>
>     </book>
>     <book>
>         <title>A Tale of Two Cities</title>
>     </book>
> </library>';
> $XMLdoc = XMLReader::XML($library);
>
> It seems to me that the XMLReader object essentially functions as a 
> pointer.
>
> QUESTION 1
> I'm guessing that calling $XMLdoc->next(); moves the pointer like this.
>
> POINTER--> <library>
>                 <book>
>                 ...
>
> However, a call to readOuterXML(), readInnerXML(), etc. results in 
> nothing being printed.
>
> Another $XMLdoc->next(); call results in
>                 ...
>                 </book>
> POINTER--></library>
>
> And again, a call to read...XML() results in nothing being printed. 
> The second case makes sense, because you're at the end of the 
> document. I don't understand why the first call returns nothing.
>
>
> QUESTION 2
> A similar scenario using XMLReader::read(). If I were to do successive 
> calls to $XMLdoc->read(); and $XMLdoc->readOuterXML() I get:
>
> 1. POINTER--><library>
>                 <book>
>                     ...
> Prints the whole document.
>
> 2. <library>POINTER-->(empty text node)
>                 <book>
>                     ...
> Prints nothing, as expected.
>
> 3. <library>
>     POINTER--><book>
>                     <title>Of Mice and Men</title>
>                     ...
> SHOULD print the whole book node. It doesn't.
>
> 3. <library>
>         <book>POINTER-->(empty text node)
>             <title>Of Mice and Men</title>
>             ...
> Prints nothing, as expected.
>
> 4. <library>
>         <book>
>             POINTER--><title>Of Mice and Men</title>
>             ...
> Prints <title>Of Mice and Men</title>
>
> 5. <library>
>         <book>
>             <title>POINTER-->Of Mice and Men</title>
>             ...
> Prints Of Mice and Men
>
> Why doesn't iteration 3 print the entire book node?
>
> QUESTION 2a
> Using the same scenario as above, does the read() actually read in the 
> entire document on iteration 1, or does it wait for a call to 
> readOuterXML(),readInnerXML(), etc? If it actually reads the entire 
> document, doesn't that defeat the purpose of a pull parser?
>
>
> QUESTION 3
> Starting with iteration 3 above, if I assume that it DID print the 
> whole book node, a call to $XMLdoc->next() should do this:
> <library>
>     <book>
>         <title>Of Mice and Men</title>
>     </book>
>     POINTER--><book>
>         <title>A Tale of Two Cities</title>
>     ...
>
> Now a call to readOuterXML() SHOULD print the entire 2nd book node. 
> Instead it prints nothing. Why?
>
> Thanks in advance for the help.
>
> -John
>
>
> On 9/21/2013 6:37 AM, David Soria Parra wrote:
>> John Stokes <jstokes@heartofthefyre.us> schrieb:
>>> I'm working on documenting the XMLReader and XMLWriter classes. Is 
>>> there
>>> someone on the list that can answer some questions about the details of
>>> how XMLReader works?
>> Please don't ask to ask. Sent a mail to this list or to the php.doc
>> mailinglist and just ask your question.
>>
>> Thank you
>>
>> ps.: yes there will be people that can answer questions regarding those
>> two classes
>>
>
>