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An XML parser is the component that deciphers the XML code.
That parser provides vital information to the program on how to read the file. They can be free-standing software, libraries, modules and classes. This is true for development platforms as well, such as Java or Delphi. Software is smart, but computers by themselves are ignorant.This means root elements, nesting and a declaration statement.A non-validating parser will give the code a quick check to make sure that you have all the basics in place. Parsers that validate compare a set of specific rules for each XML file, such as a DTD or schema.With these rules in hand, it goes through the XML and makes decisions about default values and validates data types.This is a parser that works outside of any other program.Unless you are building your own software, there is no need to worry about finding an XML parser. When presented with a bunch of XML code, computer hardware has no clue what it means or what to do with it.
Parsers convert that code into something the hardware will recognize and be able to work with.
Parsers come in two flavors, ones that validate and ones that do not.
When you write XML code, you need to follow the rules.
Standalone parsers are exactly what they sound like; separate packages that only parse XML.
More often than not, you will find little need for a standalone parser.
They may come in handy if you need to parse code locally, or without an editor or server package.