phpxpath-users

Root[1] vs Root

[Branko N. <bra...@in...>]

I've noticed that root absolute path need to be numbered as root[1]:
    $set  =  $x1->match("//document", "/root[1]/folder");

In case without [1] after root
    $set  =  $x1->match("//document", "/root/folder");
have got error:
*XPath error in XPath.class.php:2121* The supplied xPath '//document' 
does not *uniquely* describe a node in the xml document.

Seems strange to me, as root is always the only one.

Branko

Root[1] vs Root (2)

[Branko N. <bra...@in...>]

> I've noticed that root absolute path need to be numbered as root[1]:
>    $set  =  $x1->match("//document", "/root[1]/folder[3]");
>
> In case without [1] after root
>    $set  =  $x1->match("//document", "/root/folder[3]");
> have got error:
> *XPath error in XPath.class.php:2121* The supplied xPath '//document' 
> does not *uniquely* describe a node in the xml document.
>
> Seems strange to me, as root is always the only one.
>
> Branko

Re: Root[1] vs Root (2)

[Nigel S. <nig...@us...>]

> > I've noticed that root absolute path need to be numbered as root[1]:
> >    $set  =  $x1->match("//document", "/root[1]/folder[3]");
> >
> > In case without [1] after root
> >    $set  =  $x1->match("//document", "/root/folder[3]");
> > have got error:
> > *XPath error in XPath.class.php:2121* The supplied xPath '//document'
> > does not *uniquely* describe a node in the xml document.
> >
> > Seems strange to me, as root is always the only one.

Wherever the class takes an xPathQuery, you can miss out the [] if there is
only one relevant node, but where the class takes an absoluteXPath, that
particular argument isn't "pre evaluated" so you have to provide an
absoluteXPath. "/root" isn't a node in the document, but "/root[1]" is.
"/root" is an XPath expression (an xPathQuery) that evaluates to precisely
one node it so happens, so what we can do is to evaluate() on the /root,
then check that it returns only one node.

Your code will be faster if you supply the [] though, as it means that the
class does not needlessly have to evaluate the /root XPath expression only
to find out that there is only one root node.

Never-the-less to make the class easier to use, I've upgraded the second
parameter of match() for you to an xPathQuery rathar than an absoluteXPath,
and demand that the xPathQuery evaluate to a single node.

Cheers

Nigel

Re: Root[1] vs Root (2)

[Branko N. <bra...@in...>]

Thank you for nice explanation, Nigel. I'm also very thankful fur code 
modification.
Unfortunately my test shows error. After downloading the latest XPath 
from CVS, I tried to use

$set  =  $x1->match("//document", "/root/folder[3]");

but results have been from whole document, not only from folder[3],
with php error *"Notice*: Undefined offset: 1 in *XPath.class.php* on 
line *2126"*.

Cheers,
Branko


Nigel Swinson wrote:

>>>I've noticed that root absolute path need to be numbered as root[1]:
>>>   $set  =  $x1->match("//document", "/root[1]/folder[3]");
>>>
>>>In case without [1] after root
>>>   $set  =  $x1->match("//document", "/root/folder[3]");
>>>have got error:
>>>*XPath error in XPath.class.php:2121* The supplied xPath '//document'
>>>does not *uniquely* describe a node in the xml document.
>>>
>>>Seems strange to me, as root is always the only one.
>>>      
>>>
>
>Wherever the class takes an xPathQuery, you can miss out the [] if there is
>only one relevant node, but where the class takes an absoluteXPath, that
>particular argument isn't "pre evaluated" so you have to provide an
>absoluteXPath. "/root" isn't a node in the document, but "/root[1]" is.
>"/root" is an XPath expression (an xPathQuery) that evaluates to precisely
>one node it so happens, so what we can do is to evaluate() on the /root,
>then check that it returns only one node.
>
>Your code will be faster if you supply the [] though, as it means that the
>class does not needlessly have to evaluate the /root XPath expression only
>to find out that there is only one root node.
>
>Never-the-less to make the class easier to use, I've upgraded the second
>parameter of match() for you to an xPathQuery rathar than an absoluteXPath,
>and demand that the xPathQuery evaluate to a single node.
>
>Cheers
>
>Nigel
>
>  
>

Re: Root[1] vs Root (2)

[Nigel S. <nig...@us...>]

Ah thanks...

Code read:

   if (sizeOf($xPathSet) !== 1) {
    return FALSE;
   }
   $baseXPath = $xPathSet[>>>1<<<];

And should have read

   if (sizeOf($xPathSet) !== 1) {
    return FALSE;
   }
   $baseXPath = $xPathSet[0];

Silly off by one error.

Should hopefully work now.  If not please send .xml and .php so that I can
quickly run here and fix.

Cheers

Nigel

===========================
For the most recent version of Php.XPath, and an archive of this list visit:
http://www.sourceforge.net/projects/phpxpath
----- Original Message -----
From: "Branko Namestnik" <bra...@in...>
To: <php...@li...>
Sent: Tuesday, August 06, 2002 11:12 PM
Subject: Re: Root[1] vs Root (2)


> Thank you for nice explanation, Nigel. I'm also very thankful fur code
> modification.
> Unfortunately my test shows error. After downloading the latest XPath
> from CVS, I tried to use
>
> $set  =  $x1->match("//document", "/root/folder[3]");
>
> but results have been from whole document, not only from folder[3],
> with php error *"Notice*: Undefined offset: 1 in *XPath.class.php* on
> line *2126"*.
>
> Cheers,
> Branko
>
>
> Nigel Swinson wrote:
>
> >>>I've noticed that root absolute path need to be numbered as root[1]:
> >>>   $set  =  $x1->match("//document", "/root[1]/folder[3]");
> >>>
> >>>In case without [1] after root
> >>>   $set  =  $x1->match("//document", "/root/folder[3]");
> >>>have got error:
> >>>*XPath error in XPath.class.php:2121* The supplied xPath '//document'
> >>>does not *uniquely* describe a node in the xml document.
> >>>
> >>>Seems strange to me, as root is always the only one.
> >>>
> >>>
> >
> >Wherever the class takes an xPathQuery, you can miss out the [] if there
is
> >only one relevant node, but where the class takes an absoluteXPath, that
> >particular argument isn't "pre evaluated" so you have to provide an
> >absoluteXPath. "/root" isn't a node in the document, but "/root[1]" is.
> >"/root" is an XPath expression (an xPathQuery) that evaluates to
precisely
> >one node it so happens, so what we can do is to evaluate() on the /root,
> >then check that it returns only one node.
> >
> >Your code will be faster if you supply the [] though, as it means that
the
> >class does not needlessly have to evaluate the /root XPath expression
only
> >to find out that there is only one root node.
> >
> >Never-the-less to make the class easier to use, I've upgraded the second
> >parameter of match() for you to an xPathQuery rathar than an
absoluteXPath,
> >and demand that the xPathQuery evaluate to a single node.
> >
> >Cheers
> >
> >Nigel
> >
> >
> >
>
>
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> Phpxpath-users mailing list
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> https://lists.sourceforge.net/lists/listinfo/phpxpath-users
>

Re: Root[1] vs Root (2)

[Branko N. <bra...@in...>]

Works!

Thank you!
Branko

Nigel Swinson wrote:

>Ah thanks...
>
>Code read:
>
>   if (sizeOf($xPathSet) !== 1) {
>    return FALSE;
>   }
>   $baseXPath = $xPathSet[>>>1<<<];
>
>And should have read
>
>   if (sizeOf($xPathSet) !== 1) {
>    return FALSE;
>   }
>   $baseXPath = $xPathSet[0];
>
>Silly off by one error.
>
>Should hopefully work now.  If not please send .xml and .php so that I can
>quickly run here and fix.
>
>Cheers
>
>Nigel
>
>===========================
>For the most recent version of Php.XPath, and an archive of this list visit:
>http://www.sourceforge.net/projects/phpxpath
>----- Original Message -----
>From: "Branko Namestnik" <bra...@in...>
>To: <php...@li...>
>Sent: Tuesday, August 06, 2002 11:12 PM
>Subject: Re: Root[1] vs Root (2)
>
>
>  
>
>>Thank you for nice explanation, Nigel. I'm also very thankful fur code
>>modification.
>>Unfortunately my test shows error. After downloading the latest XPath
>>from CVS, I tried to use
>>
>>$set  =  $x1->match("//document", "/root/folder[3]");
>>
>>but results have been from whole document, not only from folder[3],
>>with php error *"Notice*: Undefined offset: 1 in *XPath.class.php* on
>>line *2126"*.
>>
>>Cheers,
>>Branko
>>
>>
>>Nigel Swinson wrote:
>>
>>    
>>
>>>>>I've noticed that root absolute path need to be numbered as root[1]:
>>>>>  $set  =  $x1->match("//document", "/root[1]/folder[3]");
>>>>>
>>>>>In case without [1] after root
>>>>>  $set  =  $x1->match("//document", "/root/folder[3]");
>>>>>have got error:
>>>>>*XPath error in XPath.class.php:2121* The supplied xPath '//document'
>>>>>does not *uniquely* describe a node in the xml document.
>>>>>
>>>>>Seems strange to me, as root is always the only one.
>>>>>
>>>>>
>>>>>          
>>>>>
>>>Wherever the class takes an xPathQuery, you can miss out the [] if there
>>>      
>>>
>is
>  
>
>>>only one relevant node, but where the class takes an absoluteXPath, that
>>>particular argument isn't "pre evaluated" so you have to provide an
>>>absoluteXPath. "/root" isn't a node in the document, but "/root[1]" is.
>>>"/root" is an XPath expression (an xPathQuery) that evaluates to
>>>      
>>>
>precisely
>  
>
>>>one node it so happens, so what we can do is to evaluate() on the /root,
>>>then check that it returns only one node.
>>>
>>>Your code will be faster if you supply the [] though, as it means that
>>>      
>>>
>the
>  
>
>>>class does not needlessly have to evaluate the /root XPath expression
>>>      
>>>
>only
>  
>
>>>to find out that there is only one root node.
>>>
>>>Never-the-less to make the class easier to use, I've upgraded the second
>>>parameter of match() for you to an xPathQuery rathar than an
>>>      
>>>
>absoluteXPath,
>  
>
>>>and demand that the xPathQuery evaluate to a single node.
>>>
>>>Cheers
>>>
>>>Nigel
>>>
>>>
>>>
>>>      
>>>
>>
>>-------------------------------------------------------
>>This sf.net email is sponsored by:ThinkGeek
>>Welcome to geek heaven.
>>http://thinkgeek.com/sf
>>_______________________________________________
>>Phpxpath-users mailing list
>>Php...@li...
>>https://lists.sourceforge.net/lists/listinfo/phpxpath-users
>>
>>    
>>
>
>
>
>-------------------------------------------------------
>This sf.net email is sponsored by:ThinkGeek
>Welcome to geek heaven.
>http://thinkgeek.com/sf
>_______________________________________________
>Phpxpath-users mailing list
>Php...@li...
>https://lists.sourceforge.net/lists/listinfo/phpxpath-users
>
>  
>