upnp search problems

[mick3]

I really appreciate the fast response when searching for an album by title for instance. I use this option mainly in order to obtain corresponding album id which can be sent to my upnp/dlna speakers.

Following search criteria do not work (in my opinion):
upnp:class = "object.container.storageFolder"
dc:title contains ""Eroica""
I do not receive any syntax error but just get no match.

Are there restrictions regarding upnp:class?
How can one search for titles containing double quotes?

with kind regards from mick