frame

This command will define a data frame or return the contents and metadata of a defined frame. To define a new frame you need to provide a collection name, a frame name followed by a list of dotpath/label pairs. The labels are used as object attribute names and the dot paths as the source of data. You also need a list of keys.
By default the keys are read from standard input. With options you can include a specific file or even indicate to use all the keys in a collection. In this example we are creating a frame called "title-authors-year" based on the titles, authors and publication year from a dataset collection called pubs.ds. Note the labels of "Title", "Authors", "PubYear" are on the right side the an equal sign and the dot paths to the left.

    dataset keys pubs.ds |\
        dataset frame pubs.ds "title-authors-year" \
                ".title=Title" \
                ".authors=Authors" \
                ".publication_year=PubYear"

The objects in the frame's object list will look like

    {
        "Title": ...,
        "Authors": ...,
        "PubYear": ...,
    }

This allows you to create convenient names for otherwise deep dot paths.