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Comment by masklinn | Hacker News Reader

Jq is xpath, this looks to be xquery. In fact it specifically works as an xquery embed.

You can write the example below in jq as

    def avg: add / length;
    group_by(.url) | map({
      "url": .[0].url,
      "hits": length, 
      "avg": map(.response_time) | avg
    })

so jq should be (at least roughly) as powerful as JSONiq.

... although, it seems neither JSONIq nor jq contain a "parent" operator, as far as I can tell.

This might be too restricting regarding the storage.

But we have a function: https://github.com/sirixdb/brackit

Not that not having it makes either of them any less powerful. If you descend to an inner context, you can refer to the parent/ancestor via a variable you can set before-hand.

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