Apologies in advance for the newbie question, but having read the tutorials and I think the relevant pages of the documentation, I haven't been able to find answers to this, perhaps because my application is different from many.
Most libxml2 examples (and possibly most usages) envisage an xml file being parsed, and then the document destroyed. Provided everything is destroyed when the document is destroyed, people are happy. My proposed use is to use the xmlDocument structure throughout the life a long running daemon process, and to prune on and off various new bits into the XML tree. This is in essence because the daemon is passed bits of XML (without DTD, therefore incorporating bits it can regard as opaque). Efficient memory management is therefore important to me. So, questions: 1. Can an xmlNode that has children in document tree be "pruned" from one document and added to another together with its children? Is this a simple matter of doing an xmlAddChild? (ie are operations like xmlAddChild safe with xmlNodes that already form part of the same or a different document). 2. xmlNodes can be created without adding them to an xmlDocument. Can such an xmlNode have children? If so how do I prune a subtree of xmlNodes off an existing tree without adding them to a new one (i.e. how do I reverse xmlAddChild)? I think this is xmlUnlinkNode though the documentation refers to this as unlinking it from its "current context". Does that mean it is unlinked from just its parent? Or its children too? 3. If I want to prune a node and its children and delete them how can I do that without risking a memory leak? Does xmlUnlinkNode followed by xmlFreeNode (which is described as recursive) do that. If the node is unlinked, how can it have children? 4. Is it safe to xmlFreeNode a node which is part of a tree? I get the feeling some calls (e.g. xmlAddChild) will deal intelligently with the node's existing parents or children, but some (perhaps e.g. xmlFreeNode) will not. Is there a list somewhere, or perhaps better an idiots guide to how these tree manipulation operations work? -- Alex Bligh _______________________________________________ xml mailing list, project page http://xmlsoft.org/ [email protected] http://mail.gnome.org/mailman/listinfo/xml
