Libxml2 weirdness

Question

I've been trying to use the libxml2 API in C recently but I have noticed something strange. If I use it to create a new XML document and save it with xmlSaveFormatFile, newlines and indentations will be added properly. But if I parse an existing XML document, add nodes to the tree and resave with xmlSaveFormatFile (to a new file or overwriting) everything I added since the last save will all be on one line. This can probably fixed after the fact with a simple hack but does anyone know what's going on?
A test case is here:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
int main() {
xmlDocPtr doc;
xmlNodePtr node;
xmlNodePtr root_node;
doc = xmlNewDoc("1.0");
root_node = xmlNewDocNode(doc, NULL, (const xmlChar*) "outer", NULL);
xmlDocSetRootElement(doc, root_node);
node = xmlNewTextChild(root_node, NULL, (const xmlChar *) "inner1", NULL);
xmlNewTextChild(node, NULL, (const xmlChar *) "tag", "hello");
xmlNewTextChild(node, NULL, (const xmlChar *) "tag", "hello");
xmlNewTextChild(node, NULL, (const xmlChar *) "tag", "hello");
xmlSaveFormatFile("./test.xml", doc, 1);
xmlFreeDoc(doc);
doc = xmlParseFile("./test.xml");
root_node = xmlDocGetRootElement(doc);
node = xmlNewTextChild(root_node, NULL, (const xmlChar *) "inner2", NULL);
xmlNewTextChild(node, NULL, (const xmlChar *) "tag", "hello");
xmlNewTextChild(node, NULL, (const xmlChar *) "tag", "hello");
xmlNewTextChild(node, NULL, (const xmlChar *) "tag", "hello");
xmlSaveFormatFile("./test.xml", doc, 1);
xmlFreeDoc(doc);

Answer 1

waznelle wrote:
I downloaded latest version of Libxml2 and Libxslt and compiled it on two machines.
Why?
Since it was still referencing the old libraries, I followed advice from: http://jamesclarke.net/notes/libxml2 and ran the following:
$ cd /usr/lib
$ sudo mv libxml2.2.dylib libxml2.2.dylib.old
$ sudo mv libxml2.dylib libxml2.dylib.old
$ sudo mv libxml2.la libxml2.la.old
You mean the instructions from "18 July 2004"? The ones right below the red warning text that reads "WARNING: Do not follow these instructions on Leopard (10.5). See the notes at the bottom of the page."? Those instructions?
In any case, I just wanted to post this and see if anyone else has experienced the same problems and/or if there was something I should have done differently.
If you boot into single user mode, you may be able to fix these references.
As for a suggestion about what you should have done differently, I would say never, ever overwrite any system software. What is it about the current system software version that is lacking?