Hi Markus, The Wikitude SDK does caching of .wtc files internally. They are cached as long as the SDK object is alive in memory. Once it's destroyed, all cached resources are thrown away as well.
Is it possbile to use a external html5 manifest file to cache the request to the wtc file or is it possible to enable caching features in the Webview, like http://gist.github.com/jaydeepw/3594828?
Markus Schmid