Question

This questions is related to this thread regarding the use of XML combinator which is part of the Google’s Scala gdata client library found here

1. In the code posted, there was no parameter for elem(“segment”…) Wouldn’t this cause compiler to complain something like “could not find implicit value for parameter ns: (String, String)”

2. How do you generate XML elements without each tag having a name space prefix added. For example, the code I generated looks like:

   <yt:entry xmlns:yt="http://gdata.youtube.com/schemas/2007">
       <yt:title type="TextType">MyTitle</yt:title>
       <yt:summary>My Summary</yt:summary>
   </yt:entry>
   

But I don’t want each tag to have the namespace prefix!! How do I use the combinator to generate such XML.

Here is what my pickler looks like:

def pickler: Pickler[YtPlaylist] = {
    (wrap (elem("entry",
           elem("title", text ~ attr("type", text))
           ~ elem("summary", text))(Uris.ytNs))
          (YtPlaylist.apply)
          ({p => new ~(p.title, p.titleType) ~ p.summary}))
}

case class YtPlaylist(title: String, titleType: String, summary: String)

The example I found on the web doesn’t specify the namespace, but without it I always gets compilation error. How do I generate XML elements without namespace??

Answer 1

Yes, you will need to define a namespace. Use the null prefix to define the default namespace:

implicit val ns = (null: String, "http://gdata.youtube.com/schemas/2007")