The NPCL API provides two classes for saving a schema. To save a schema to an NPCL XML file, use the class NetworkedPlanet.Npcl.XmlSchemaWriter. To write a schema to a topic map stored in a TMCore server, you can use the class NetworkedPlanet.Npcl.TopicMapSchemaWriter.

The XmlSchemaWriter is simply initialised with the XmlWriter that the output is to be written to. Some control over how the schema is written is provided by the properties NpclPrefix which sets the prefix to be used for the NPCL XML Namspace; and WriteAsFragment which controls whether the schema is written as a full XML document or as a fragment (with no XML declaration).

FileInfo outputFile = new FileInfo("myschema.xml");
Stream output = outputFile.Open(FileMode.Create, FileAccess.Write);
XmlTextWriter xmlWriter = new XmlTextWriter(output, System.Text.Encoding.UTF8);
xmlWriter.Formatting = Formatting.Indented;
// Create a new XmlSchemaWriter to write as a full XML document 
// using the prefix "npcl" for the NPCL XML Namespace.
XmlSchemaWriter schemaWriter = new XmlSchemaWriter(xmlWriter, false, "npcl");
schemaWriter.WriteSchema(originalSchema);
// NOTE: The XmlSchemaWriter does not close the XmlWriter at the end of the document.
xmlWriter.Close();

The TopicMapSchemaWriter class writes the schema information into an ITopicMap instance, storing the schema information in the TMCore database as topics and associations in the topic map. The TopicMapSchemaWriter can operate in one of three different modes.

TopicMapSchemaWriter writer = new TopicMapSchemaWriter(tm, SchemaWriterMode.ReplaceAll);
writer.WriteSchema(originalSchema);