plugin XEP-0048, XEP-0402; CLI (bookmarks): implement XEP-0402 (PEP Native Bookmarks): - Former bookmarks implementation is now labeled as "legacy". - XEP-0402 is now used for bookmarks when relevant namespaces are found, and it fallbacks to legacy XEP-0048/XEP-0049 bookmarks otherwise. - CLI legacy bookmark commands have been moved to `bookmarks legacy` - CLI bookmarks commands now use the new XEP-0402 (with fallback to legacy one automatically used if necessary).

from typing import Optional

from twisted.words.xish import domish


class BaseError(Exception):
    namespace: str
    condition: str
    text: Optional[str]
    textLang: Optional[str]
    appCondition: Optional[domish.Element]

class StanzaError(BaseError):
    ...