That depends on what you want to do, xml tools include;

xml parsers

xml validators

xml editors

xml schema editors

xml code generators

what are the component of xml document what are the component of xml document

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.

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.

If you open the xml in most web browser it will state an error code denoting the type of malformation of the xml.

you can use an xml tool like an xml editor to validate and correct your xml.