GPO provides the capability to download XML in bulk for select collections from https://www.govinfo.gov/bulkdata.
Please see the User Guides within this repository for more information on how to make use of the XML data for the available collections.
The govinfo team has migrated bulk data functionality to govinfo.
https://www.govinfo.gov/bulkdata
New in govinfo, you can add /xml or /json to any govinfo bulkdata link to receive the listing in that format.
https://www.govinfo.gov/bulkdata/BILLS/115/1/hjres
XML: https://www.govinfo.gov/bulkdata/xml/BILLS/115/1/hjres
JSON: https://www.govinfo.gov/bulkdata/json/BILLS/115/1/hjres
Federal Register Issues from September 2012: http://www.govinfo.gov/bulkdata/FR/2012/09
Code of Federal Regulations: http://www.govinfo.gov/bulkdata/CFR/
Bills back to the 113th Congress: http://www.govinfo.gov/bulkdata/BILLS