`xmllint --format in.xml > out.xml`
`xmlstarlet format in.xml > out.xml`
Each of these two programs has switches for canonicalization, too.
But these are not XSLT solutions, so are bit off-topic.
I have a some very large XML source files. Each is are currently
formatted as one long string (ie no line breaks).
I need to add some processing instructions at various points in the
file but I don't want to introduce any significant whitespace in
the process of doing so.
I have XMLSpy but it does not seem to be capable of doing a
schema-aware "pretty-print".
A web search seems to indicate that OXygen is capable of doing an
intelligent pretty-print (the information I found is in the context
of XHTML but I assume it's more generalized than that??), however,
I can't really justify buying it just for that.
If needs be, I can write an XSLT to parse a DTD, classify each
element as "inline", "mixed", "block" or "empty" and then do an
identity transform against my XML source files inserting
line-breaks and leading tabbing as required.
I am wondering if anyone else has any other suggestions for me?
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