 We report a characterisation of LD producers' needs, and introduce the concept of path-based summaries, which carries a higher level of semantics, to meet their needs .
<clarity>  We report a characterisation of LD producers' needs, and introduce the concept of path-based summaries, which carries a higher level of semantics, to meet their needs .
 We introduce path outlines: conceptual objects characterizing sequences of triples with descriptive statistics. We interview 11 data producers to evaluate their interest .