1 files changed, 39 insertions, 0 deletions
diff --git a/share/extensions/inkex/interfaces/IElement.py b/share/extensions/inkex/interfaces/IElement.py
new file mode 100644
index 0000000..3e9df53
--- /dev/null
+++ b/share/extensions/inkex/interfaces/IElement.py
@@ -0,0 +1,39 @@
+"""Element abstractions for type comparisons without circular imports
+
+.. versionadded:: 1.2"""
+
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+
+import sys
+from lxml import etree
+
+if sys.version_info >= (3, 8):
+    from typing import Protocol
+else:
+    from typing_extensions import Protocol
+
+
+class IBaseElement(ABC, etree.ElementBase):
+    """Abstraction for BaseElement to avoid circular imports"""
+
+    @abstractmethod
+    def get_id(self, as_url=0):
+        """Returns the element ID. If not set, generates a unique ID."""
+        raise NotImplementedError
+
+
+class BaseElementProtocol(Protocol):
+    """Abstraction for BaseElement, to be used as typehint in mixin classes"""
+
+    def get_id(self, as_url=0) -> str:
+        """Returns the element ID. If not set, generates a unique ID."""
+
+    @property
+    def root(self) -> ISVGDocumentElement:
+        """Returns the element's root."""
+
+
+class ISVGDocumentElement(IBaseElement):
+    """Abstraction for SVGDocumentElement"""