start implementation on new architecture

sia/entry.py

@@ -0,0 +1,50 @@
+from abc import ABC, abstractmethod
+from datetime import datetime
+import xml.etree.ElementTree as ET
+
+class Entry(ABC):
+    """
+    Abstract base class for all entry types in the working memory.
+    
+    Attributes:
+        id: Unique identifier for the entry
+        timestamp: When the entry was created
+    """
+    
+    def __init__(self, id: str, timestamp: datetime):
+        """
+        Initialize a new entry with provided id and timestamp.
+        
+        Args:
+            id: Unique identifier for this entry
+            timestamp: Creation timestamp for this entry
+        """
+        self.id = id
+        self.timestamp = timestamp
+    
+    @abstractmethod
+    def update(self) -> None:
+        """
+        Update the entry's state.
+        Must be implemented by concrete classes.
+        """
+        pass
+    
+    @abstractmethod
+    def generate_context(self) -> ET.Element:
+        """
+        Generate an XML Element representing this entry's context.
+        Must be implemented by concrete classes.
+        
+        Returns:
+            ET.Element: XML element containing the entry's data
+        """
+        pass
+
+    def cleanup(self) -> None:
+        """
+        Clean up any resources used by this entry.
+        Should be overridden by classes that need cleanup.
+        Default implementation does nothing.
+        """
+        pass