adding namespaces to XML with boost

问题

I'm trying to generate an xml using boost. Going fine so far, but the xml that gets generated needs to have a namespace.

so instead of <name>"Harry"</name> it would say <ns1:name>"Harry"</ns1:name>

Is there any way to add a namespace to the XML with boost without manually adding the "ns1" to every line?

回答1:

Is there any way to add a namespace to the XML with boost without manually adding the "ns1" to every line?

Assuming you use rapidxml, no you cannot. You could however extend rapidxml to support this or obtain a copy of a parser that does support this (see sehe's answer).

There is even a fork of rapidxml which already supports this (you would just have to replace it). Or you could just add the namespace by manually adding the string.

回答2:

Boost doesn't have an XML library, so you can't.

I'd suggest picking your XML library from here: What XML parser should I use in C++?

My personal favorite is PugiXML Update Pugi doesn't support namespaces (eek):

Namespace nodes are not supported (affects namespace:: axis).

However, to answer this part of the question:

Is there any way to add a namespace to the XML with boost without manually adding the "ns1" to every line?

You could logically achieve with the (dubious) feature Default Namespaces:

<?xml version="1.0"?>
library xmlns="http://eric.van-der-vlist.com/ns/library">
...
</library>

Everything will be seen as logically from that namespace, even without a prefix.

Now, boost doesn't document how to do this, but you can get to it:

Add xml-stylesheet processing instructions to boost property_tree

回答3:

So, I managed to get the result I wanted. Here's what I did:

My outer most element was called 'Document':

ptree& documentnode = pt.add("namespace1:Document", "");

then added tags to the element for each namespace:

pt.add("Document.<xmlattr>.xmlns:namespace1", "value");

Then in front of each element I'll have to add "namespace1":

documentnode.add("namespace1:name", "Harry");

output:

<namespace1:Document xmlns:namespace1=value>
    <namespace1:name>Harry</namespace1:name>
</namespace1:Document>

Probably not the best solution, but it suits my needs.

来源：https://stackoverflow.com/questions/35060551/adding-namespaces-to-xml-with-boost