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<TITLE>CPLRemoveXMLChild doesn't work (And I can't figure out how it's supposed to)</TITLE>
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<P><FONT SIZE=2>I had a bug in my program that I had to go<BR>
through the trouble of building GDAL and Xerces<BR>
to track down, and here's what I've come to:<BR>
<BR>
CPLRemoveXMLChild<BR>
<BR>
It's supposed to cleanly remove a child from<BR>
the parent's list of children. Instead, it<BR>
seems to simply set the parent's psChild to<BR>
NULL. Naturally, I decided to step through the<BR>
function to see what was happening.<BR>
<BR>
int CPLRemoveXMLChild( CPLXMLNode *psParent, CPLXMLNode *psChild ){<BR>
CPLXMLNode *psLast = NULL, *psThis;<BR>
if( psParent == NULL )<BR>
return FALSE;<BR>
for( psThis = psParent->psChild; psThis != NULL; psThis = psThis->psNext ){<BR>
if( psThis == psChild ) {<BR>
if( psLast == NULL )<BR>
psParent->psChild = psThis->psNext;<BR>
else<BR>
psLast->psNext = psThis->psNext;<BR>
psThis->psNext = NULL;<BR>
return TRUE;<BR>
}<BR>
}<BR>
return FALSE;<BR>
}<BR>
<BR>
So, first off, it sets psLast to Null, never<BR>
changes it, then uses it in an if statement.<BR>
Then, the line of code which is now bound to<BR>
be executed when the child is found sets<BR>
psParent's child to the psChild's next sibling,<BR>
eliminating all of the previous sibling that<BR>
should still belong to the parent. The ultimate<BR>
result is that it eliminates all siblings up<BR>
until the psChild's (the psChild to be removed)<BR>
next sibling.<BR>
<BR>
As far as I can tell, this is what the method<BR>
should be doing reliably, and it's what I've<BR>
observed it doing in practice. This contradicts<BR>
what it is stated to be doing in the documentation.<BR>
<BR>
<BR>
</FONT>
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