The full form of NCX in ebookstudio is Navigation Control XML. It is a file format used in e-books to provide navigation options and structure for readers to easily navigate through the content of the e-book.
it is the same way to create xml file by converting into txt you have to use the correct xml syntax ie <xml> this is to denote strat of xml file and this </xml> denotes end of xml file. You have to use the right xml code or your xml file wont be valid or well formed.
navication control xml
You can see or view an xml file with a plain text editor like notepad or you can use a dedicated xml editor. With an xml editor you can also validate your xml file which means you can correct any errors in your xml file.
there is no source code, xml is not a programming language, its a markup language for which you create your own tags, the basic xml syntax is <xml> to start an xml file, and </xml> to end the xml file.
SAX (Simple API for XML) is a serial access parser API for XML. SAX provides a mechanism for reading data from an XML document.
XML-based User interface Language
an xml schema is a blueprint for your xml file and it dictates what can and cannot be in your xml file. it also is a blueprint as i said and so it outlines the tsructure of your file, the nodes, elements, child, attributes etc
XML
XML Schema is an XML-based alternative to DTD.An XML schema describes the structure of an XML document.The XML Schema language is also referred to as XML Schema Definition (XSD).An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntactical constraints imposed by XML itself.
XML file can be used for exchanging data . This is so because in XML file data is stored in form of nodes and sub nodes .Ex Facebook status is stored in one node then there are sub nodes for like, comment and share .
When referring to Excel 2007, there are two file types you can use when you save a file, XML and binary. If you save the file as binary, then there is no difference between the two. If you save the file as XML, then the XML file contains XML formatting data (explanation beyond the scope of this question) and the binary file is formatted for computers to read directly.