Include some json schemas within pystac

CHANGELOG.md

@@ -19,6 +19,7 @@
 - `max_items` and `recursive` to `Catalog.validate_all` ([#1141](https://github.com/stac-utils/pystac/pull/1141))
 - `KML` as a built in media type ([#1127](https://github.com/stac-utils/pystac/issues/1127))
 - `move/copy/delete` operations for local Assets ([#1158](https://github.com/stac-utils/pystac/issues/1158))
+- Latest core STAC spec jsonshemas are included in pytstac and used for validation ([#1165](https://github.com/stac-utils/pystac/pull/1165))
 
 ### Changed
 

docs/concepts.rst

@@ -394,9 +394,13 @@ You can validate any :class:`~pystac.Catalog`, :class:`~pystac.Collection` or
 
    item.validate()
 
-This will validate against the latest set of JSON schemas hosted at
-https://schemas.stacspec.org, including any extensions that the object extends. If there
-are validation errors, a :class:`~pystac.validation.STACValidationError` will be raised.
+This validates against the latest set of JSON schemas (which are included with the
+PySTAC package) or older versions (which are hosted at https://schemas.stacspec.org).
+This validation includes any extensions that the object extends (these are always
+accessed remotely based on their URIs).
+
+If there are validation errors, a :class:`~pystac.validation.STACValidationError`
+is raised.
 
 You can also call :meth:`~pystac.Catalog.validate_all` on a Catalog or Collection to
 recursively walk through a catalog and validate all objects within it.

pystac/errors.py

@@ -95,6 +95,10 @@ def __init__(
         super().__init__(msg)
 
 
+class STACLocalValidationError(Exception):
+    """Schema not available locally"""
+
+
 class STACValidationError(Exception):
     """Represents a validation error. Thrown by validation calls if the STAC JSON
     is invalid.