Querying nesting-subsector technologies about gcam-core HOT 2 OPEN

I believe you just add an extra "/" to the query where the nesting subsector is in the XML hierarchy.

from gcam-core.

Unfortunately this isn't as easy as we'd like it to be...what Steve wrote is correct, and you can see it in the example queries for the electric power sector in GCAM-USA at the bottom of Main_queries.xml.
*[@type='sector' ]//*[@type='subsector']//*[@type='technology']
However I don't know that there's a single query that one can write that will return the desired information (1) across all levels of nesting (i.e., for sectors with one and with two levels of subsectors), and (2) in all platforms. That query might return the full set of results in the ModelInterface GUI, with the second subsector just returning missing values in the sectors that don't have two levels of subsectors, but then you might get just the results with two levels of subsectors in rgcam. I think I've even seen queries fail to run that have this issue. I generally use multiple queries for this, where the one with two slashes is targeted to the sectors that have multiple levels of subsectors.

from gcam-core.