The repository is filled with nodes of the mixin type 'mix:title' and different values of the 'jcr:description' property.
root
document1 (mix:title) jcr:description = "The quick brown fox jumps over the lazy dog."
document2 (mix:title) jcr:description = "The brown fox lives in a forest." // This is the node we want to find
document3 (mix:title) jcr:description = "The fox is a nice animal."
document4 (nt:unstructured) jcr:description = "There is the word forest, too."