some additions to pR 1794:

add a special XMLAttributeError class to indicate an error when accessing a missing attribute
in PropertyContainer::Restore make error handling more flexible

src/Base/Exception.cpp

@@ -210,14 +210,13 @@ XMLBaseException::XMLBaseException(const XMLBaseException &inst)
 
 // ---------------------------------------------------------
 
-
 XMLParseException::XMLParseException(const char * sMessage)
-  : Exception(sMessage)
+  : XMLBaseException(sMessage)
 {
 }
 
 XMLParseException::XMLParseException(const std::string& sMessage)
-  : Exception(sMessage)
+  : XMLBaseException(sMessage)
 {
 }
 
@@ -227,13 +226,40 @@ XMLParseException::XMLParseException()
 }
 
 XMLParseException::XMLParseException(const XMLParseException &inst)
-  : Exception(inst)
+  : XMLBaseException(inst)
 {
 }
 
 const char* XMLParseException::what() const throw()
 {
-    return Exception::what();
+    return XMLBaseException::what();
+}
+
+// ---------------------------------------------------------
+
+XMLAttributeError::XMLAttributeError(const char * sMessage)
+  : XMLBaseException(sMessage)
+{
+}
+
+XMLAttributeError::XMLAttributeError(const std::string& sMessage)
+  : XMLBaseException(sMessage)
+{
+}
+
+XMLAttributeError::XMLAttributeError()
+{
+    _sErrMsg = "XML attribute error";
+}
+
+XMLAttributeError::XMLAttributeError(const XMLAttributeError &inst)
+  : XMLBaseException(inst)
+{
+}
+
+const char* XMLAttributeError::what() const throw()
+{
+    return XMLBaseException::what();
 }
 
 // ---------------------------------------------------------
@@ -827,7 +853,6 @@ CADKernelError::CADKernelError(const CADKernelError &inst)
 }
 
 
-// ---------------------------------------------------------
 // ---------------------------------------------------------
 
 RestoreError::RestoreError()

src/Base/Exception.h

@@ -179,7 +179,7 @@ public:
  * The XMLParseException is thrown if parsing an XML failed.
  * @author Werner Mayer
  */
-class BaseExport XMLParseException : public Exception
+class BaseExport XMLParseException : public XMLBaseException
 {
 public:
   /// Construction
@@ -197,6 +197,28 @@ public:
   virtual const char* what() const throw();
 };
 
+/**
+ * The XMLAttributeError is thrown if a requested attribute doesn't exist.
+ * @author Werner Mayer
+ */
+class BaseExport XMLAttributeError : public XMLBaseException
+{
+public:
+  /// Construction
+  XMLAttributeError(const char * sMessage);
+  /// Construction
+  XMLAttributeError(const std::string& sMessage);
+  /// Construction
+  XMLAttributeError();
+  /// Construction
+  XMLAttributeError(const XMLAttributeError &inst);
+
+  /// Destruction
+  virtual ~XMLAttributeError() throw() {}
+  /// Description of the exception
+  virtual const char* what() const throw();
+};
+
 /** File exception handling class
  * This class is specialized to go with exception thrown in case of File IO Problems.
  * @author Juergen Riegel

src/Base/Reader.cpp

@@ -175,8 +175,8 @@ const char*  Base::XMLReader::getAttribute (const char* AttrName) const
     else {
         // wrong name, use hasAttribute if not sure!
         std::ostringstream msg;
-        msg << "Attribute: \"" << AttrName << "\" not found";
-        THROWM(Base::AttributeError, msg.str());
+        msg << "XML Attribute: \"" << AttrName << "\" not found";
+        throw Base::XMLAttributeError(msg.str());
     }
 }