Creating Sitemap with Construct

I think you'd be looking for the nested="false" parameter on the nodes tag pair so you could output everything in a flat tag loop.

{exp:construct:nodes tree_id="2" nested="false"}
	{!-- Sitemap Code Stuff --}
{/exp:construct:nodes}

ok that seemed to give me all the top level pages from within Construct... so after that I'd just have to add channel:entries to get all the pages from entries I'm guessing.

One question, how would I get the <lastmod> for all those pages from Construct? I tried this but it didn't work http://prntscr.com/gfwk65

The construct nodes tag does not provide any info from the entry (like edit_date). You'd need to use the channel entries tag for that and provide it the node_entry_id. If you're just getting the entry date from the entry, you might want to try Last Edit Edit as it would be a much lighter query than the Channel Entries tag for every node:

https://buzzingpixel.com/software/last-edit-date/documentation/template-tag

I thought the nested="false" parameter should provide all nodes from the tree as if they were top level nodes, but I might be mis-remembering how I wrote that. If it's not, you could just do something like:

{exp:construct:nodes tree_id="1"}
    <url>
        <loc>{site_url}{construct:node_link}</loc>
    </url>
    {construct:children}
{/exp:construct:nodes}

sorry, nested="false" does provide all subpages as well. that works.

I installed Last Edit... but the dates don't seem correct. seems like entry has todays date but the Times are different. I know i didn't edit all those entries today so something don't seem right.

2017-09-01T14:24:54-04:00

{exp:last_edit_date

 channel_id="{construct:node_entry_id}"
 format="{DATE_W3C}"
 status="open"
 show_future_entries="true"

}

http://prntscr.com/gfxhy2

You're using the channel_id parameter on the Last Edit Date tag. You'll want to use the entry_id parameter.