Re: [xml] Child Traversing loop runs twice

[andrew james <andrew systemssingular com>]

siddharth sehgal wrote:
> Hi
>
> I am new to libxml2 and intend to use it in my application which will 
> run on embedded windows/ linux. I was trying to get hold of some common 
> xml parsing routines and there is an interesting observation which I 
> cannot resolve. although the xml I am parsing is a bit more elaborative 
> but the observation persists on simple xml like this also.
>
> <?xml version="1.0" ?>
> <CAST>
>     <a />
>     <b />
>     <c />
> </CAST>
>
>
> xmlDocPtr doc;
> xmlNodePtr topcur;
> .
> .
> doc = xmlParseFile(ansiSTR);
> .
> .
> topcur = doc->children;//xmlDocGetRootElement(doc);//At <CAST>
> .
> .
>    
> topcur=topcur->children;
> while(topcur != NULL){
>     printf("%s\n",topcur->name);
>     topcur=topcur->next;
> }
>
> Output expected is:
> a
> b
> c
>
> Actual Output:
> text
> a
> text
> b
> text
> c
> text
>
> The loop for child traversing runs twice. I cant figure this out . Any 
> suggestions will be deeply appreciated.
>
> thanks
> Sid
>
>
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>
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Though I am inexperienced with the specifics of libxml2, I 
have used other parsers for html (xml), that also read what 
to us is like extra text nodes.

Anyone may want to correct this if I am wrong,

For some reason, someone else may know the reason, some 
parsers read text nodes between specific elements (is it the 
new line?).

for this particularity of parsers, the suggestion is that 
you add some conditions in the code to evaluate node name.

for your code that is... and someone may also know a better 
evaluation function, I used xmlStrcmp that I found in 
tutorials, normal char comparison fails, but xmlStrcmp is 
almost illogical for a human to read because it evaluates to 
0 when strings are the same...note the ! needed to initiate 
an if statement that is name = text

if(!xmlStrcmp(topcur->name, (const xmlChar *) "text")) {
   // node is 'text'
}

if(xmlStrcmp(topcur->name, (const xmlChar *) "text")) {
   // node is not 'text'
}