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You have many ways to update an XML file. Using a standard editor comes to mind. Another option, especially if you are working with a repetitive operation, is to read in the XML file using the XmlReader class, make your changes, and then write the edited XML with XmlWriter. A catch to using this method is that there is no backtracking with either the reader or the writer. Therefore, you must make all changes as the element or attribute becomes available or store them temporarily. There isn t anything new with this code. It simply isn t obvious how it s done. So here s an example of how to update an XML file in a forward-only manner. In Listing 14-9, you re adding the element <Encountered>False</Encountered> after the name of every monster. (For those of you being nitpicky, this really isn t updating the XML file it s creating a new, updated version of the XML file.)

Listing 14-9. Updating the XML Monster File using namespace System; using namespace System::Xml; void main() { XmlReader ^reader; XmlWriter ^writer; try { reader = XmlReader::Create("..\\Monsters.xml"); XmlWriterSettings ^settings = gcnew XmlWriterSettings(); settings->Indent = true; settings->IndentChars = (" "); writer = XmlWriter::Create("New_Monsters.xml", settings); while (reader->Read()) { switch (reader->NodeType) { case XmlNodeType::Comment: writer->WriteComment(reader->Value); break; case XmlNodeType::Element: writer->WriteStartElement(reader->Name); writer->WriteAttributes(reader, false); if (reader->IsEmptyElement) writer->WriteEndElement(); break; case XmlNodeType::EndElement: writer->WriteEndElement(); // *** Add new Monster Element if (reader->Name->Equals("Name")) { writer->WriteStartElement("Encountered"); writer->WriteString("False"); writer->WriteEndElement(); } break; case XmlNodeType::Text: writer->WriteString(reader->Value); break; case XmlNodeType::XmlDeclaration: writer->WriteStartDocument(); break; } }

The System Definition Model (SDM) is simply a schema definition for describing distributed systems. SDM views the world as being composed of systems. It is important to distinguish between the notion of atomic and composite systems. Atomic systems are made up of

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writer->Flush(); Console::WriteLine("Done"); } catch (Exception ^e) { Console::WriteLine("XML Update Aborted -- {0}", e->Message); } finally { if (writer->WriteState != WriteState::Closed) { writer->Close(); } if (reader->ReadState != ReadState::Closed) { reader->Close(); } } } Notice that there is no open for update mode for either the reader or the writer, so you need to open an input and an output file: XmlReader ^reader = XmlReader::Create("..\\Monsters.xml"); XmlTWriter ^writer = XmlWriter::Create("New_Monsters.xml", settings); After that, the code is standard XmlReader and XmlWriter logic. Basically, you read in each element, attribute, comment, and so on and then write them out again. When the end element of Name shows up, write it out and then dump out the new element: while (reader->Read()) { switch (reader->NodeType) { //...Other cases. case XmlNodeType::EndElement: writer->WriteEndElement(); if (reader->Name->Equals("Name")) { writer->WriteStartElement("Encountered"); writer->WriteString("False"); writer->WriteEndElement(); } break; //...The remaining cases. Figure 14-4 shows New_Monsters.xml, the output of UpdateXML.exe, displayed in the Visual Studio editor.

Figure 4 4. My god, it s full of dots!

The Document Object Model (DOM) is a specification for how to store and manipulate XML documents in memory. This differs significantly from the forward-only access just discussed, because for that method only a single node of the XML document is in memory at any one time. Having the entire document in memory has some major advantages and a couple of disadvantages compared to forward-only access. The most important advantage is that because the entire XML document is in memory, you have the ability to access any portion of the XML document at any time. This means you can read, search, write, change, and delete anywhere at any time in the document. Best of all, once you are through, you can dump the XML document back to disk with a single command. The major disadvantages are that the DOM tree can use up a lot more memory than forwardonly access, especially if the XML document is large, and that there is often a delay as the DOM tree is loaded. Are these disadvantages significant In most cases the answer is not really. Most computers have more than enough memory to handle all but the very largest XML documents (and when a document gets that large, the data should probably be in a database anyway). The slight delay is usually masked in the start-up of the application, and for the delay to be noticeable at all, the XML document needs to be quite sizable. (Again, when an XML document gets that large, it should probably be placed in a database.)

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