Using Validator to automatically fix XML

I have an XML file which I am reading into my program using Java's internal XML packages. At any given time, the XML may or may not be valid. IE, it may or may not have close all the tags it opened.
I would like to use either a dtd or a schema to let the parser validate the XML as it is read, and automatically close tags that are left dangling.
Is there a simple way to do this, or do I have to write a bunch of custom code for this?
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no.. the validator can only validate - it cannot fix the errors.

btw, for incorrect xml syntax you do not need a validator - a parser will be enough to show errors
bored_shivaAuthor Commented:
From the Java API doc:

"A validator may modify the outcome of a parse (for example by adding default values that were missing in documents), and a parser is responsible to make sure that the application will receive modified DOM trees. " (

This seems to indicate that the validator can modify the document and add in what's missing?
in general, the validator cannot add missing tags..
the statement here applies to some special cases of schema where the schema specifies a default value for certain elements and those were missing in the original document.

for this also to work, the document should be well formed and semantically correct w.r.t to the schema,

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