I don't have a URL for the "example" repository but here's one from a repository I use to test the DNA Eclipse plugin:
The repository is "dna:repository" and the workspace is "default".
The "picture.jpg" is a node representing a file. It's parent node represents a folder and has a name of "myfolder". That parent node has a parent that also represents a folder and has a name of "myproject".
This "picture.jpg" node has a child node called "jcr:content" that has a property called "jcr:lastModified".
That URL gives me the value of the "jcr:lastModified" property back as a JSON object string that looks like this:
Hope that helps.
Thanks elvis! It turns out to have been a user error. I copied the files for the example over to the war and rebuilt it but I did not notice that code changes were also necessary to actually load the cnd and xml data files into the engine. Once I created my own implementation of the repository provider that actually loaded the files, the searches started working.