Just as its empire is falling apart, the U.S. government seems to be beginning to get some linked data together. At https://resources.data.gov/
they have a link to a dcat schema called the Project Open Data Metadata Schema at https://resources.data.gov/schemas/dcat-us/v1.1/
They abbreviate Project Open Data with POD
Also, from https://ec-jrc.github.io/dcat-ap-to-schema-org/#alignment-issues,
"A general issue is determined by the fact that Schema.org and DCAT-AP address different use cases. More precisely, the main purpose of Schema.org is to enhance discovery and indexing of online resources via search engines. As such, it is addressing more general objectives compared with DCAT-AP, that is instead meant to model in detail information on datasets and data catalogues.
One of the main consequences is that some information that is relevant in DCAT-AP it is not modelled in Schema.org with specific terms. This results in a relevant amount of (a) “missing” and (b) “many-to-one” mappings - i.e., different metadata elements of DCAT-AP are mapped to the same element in Schema.org."