diff --git a/loglens/parsers/base.py b/loglens/parsers/base.py
index b16382d..8329c34 100644
--- a/loglens/parsers/base.py
+++ b/loglens/parsers/base.py
@@ -1,3 +1,5 @@
+"""Base parser class and data structures."""
+
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
 from datetime import datetime
@@ -11,43 +13,77 @@ class LogFormat(Enum):
     JSON = "json"
     SYSLOG = "syslog"
     APACHE = "apache"
-    RAW = "raw"
+    UNKNOWN = "unknown"
 
 
 @dataclass
-class ParsedEntry:
-    """Parsed log entry."""
+class ParsedLogEntry:
+    """Represents a parsed log entry."""
 
     raw_line: str
-    format: LogFormat
-    timestamp: Optional[str]
-    level: Optional[str]
-    message: str
-    metadata: dict[str, Any] = field(default_factory=dict)
-    severity: str = "info"
+    timestamp: Optional[datetime] = None
+    level: Optional[str] = None
+    message: str = ""
+    source: Optional[str] = None
+    host: Optional[str] = None
+    facility: Optional[str] = None
+    severity: Optional[str] = None
+    logger: Optional[str] = None
+    extra: dict[str, Any] = field(default_factory=dict)
+    line_number: int = 0
+    error_pattern: Optional[str] = None
 
-    def to_dict(self) -> dict:
+    def to_dict(self) -> dict[str, Any]:
         """Convert to dictionary."""
-        return {
+        result = {
             "raw_line": self.raw_line,
-            "format": self.format.value,
-            "timestamp": self.timestamp,
-            "level": self.level,
             "message": self.message,
-            "metadata": self.metadata,
-            "severity": self.severity,
+            "line_number": self.line_number,
         }
+        if self.timestamp:
+            result["timestamp"] = self.timestamp.isoformat()
+        if self.level:
+            result["level"] = self.level
+        if self.source:
+            result["source"] = self.source
+        if self.host:
+            result["host"] = self.host
+        if self.facility:
+            result["facility"] = self.facility
+        if self.severity:
+            result["severity"] = self.severity
+        if self.logger:
+            result["logger"] = self.logger
+        if self.extra:
+            result["extra"] = self.extra
+        if self.error_pattern:
+            result["error_pattern"] = self.error_pattern
+        return result
 
 
-class BaseParser(ABC):
-    """Base parser class."""
+class LogParser(ABC):
+    """Abstract base class for log parsers."""
+
+    format_name: str = "base"
 
     @abstractmethod
-    def get_format(self) -> LogFormat:
-        """Get the format this parser handles."""
+    def parse(self, line: str, line_number: int = 0) -> Optional[ParsedLogEntry]:
+        """Parse a single log line."""
         pass
 
     @abstractmethod
-    def parse(self, line: str) -> Optional[ParsedEntry]:
-        """Parse a log line."""
+    def can_parse(self, line: str) -> bool:
+        """Check if this parser can handle the given line."""
         pass
+
+    def parse_batch(self, lines: list[str]) -> list[ParsedLogEntry]:
+        """Parse multiple lines."""
+        results = []
+        for i, line in enumerate(lines, 1):
+            try:
+                entry = self.parse(line, i)
+                if entry:
+                    results.append(entry)
+            except Exception:
+                results.append(ParsedLogEntry(raw_line=line, message="Parse error", line_number=i))
+        return results