[xml] libxml 2.2 validate

[Afanasiy Fet <dailylama gmail com>]

How to validate xml against .dtd, but not include the 

<!DOCTYPE Document SYSTEM "validate.dtd">

with

xmlCreateIntSubset(doc, BAD_CAST "Document", NULL, BAD_CAST "validate.dtd");

into xml file. Best choice would be to use "xmlValidateDocument(context, document)" alternative (if such exist?) with third parameter to provide dtd filename or its string.