On failure, %FALSE is returned and @error is filled in.
If the document is encrypted, EV_DEFINE_ERROR_ENCRYPTED is returned.
If the backend cannot load the specific document, EV_DOCUMENT_ERROR_INVALID
is returned. If the backend does not support the format for the document's
contents, EV_DOCUMENT_ERROR_UNSUPPORTED_CONTENT is returned. Other errors
are possible too, depending on the backend used to load the document and
the URI, e.g. #GIOError, #GFileError, and #GConvertError.
Loads @document from @uri.
On failure, %FALSE is returned and @error is filled in. If the document is encrypted, EV_DEFINE_ERROR_ENCRYPTED is returned. If the backend cannot load the specific document, EV_DOCUMENT_ERROR_INVALID is returned. If the backend does not support the format for the document's contents, EV_DOCUMENT_ERROR_UNSUPPORTED_CONTENT is returned. Other errors are possible too, depending on the backend used to load the document and the URI, e.g. #GIOError, #GFileError, and #GConvertError.