"//node[label = '$bldg']/node[label = '$floor']/label/text()"

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should be 
"//node[label = '$bldg']/node[label = '$floor']/label"

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and 
$newnode = $parent->addSibling($new_element);

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should be 
$node->addSibling($new_element);

[download]

In reply to Re: libxml - insert node by ikegami
in thread libxml - insert node by Styric

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