[lxml-dev] Lost DTD when serialising

[Alex Klizhentas]

Hi All, I've read that

"
Serialising an ElementTree now includes any internal DTD subsets that are
part of the document, as well as comments and PIs that are siblings of the
root node.
" (from changelog)

but I've failed to achieve this goal, dtd data is lost:

        root = lxml.etree.parse(StringIO("""<?xml version="1.0"
encoding="utf-8"?>
            <!DOCTYPE schema [
              <!ATTLIST reference id ID #REQUIRED>
              <!ATTLIST joined_values id ID #REQUIRED>
              <!ATTLIST file id ID #REQUIRED>
              <!ATTLIST lookup id ID #REQUIRED>
              <!ATTLIST selector id ID #REQUIRED>
              <!ATTLIST Column id ID #REQUIRED>
            ]>
            <schema/>
        """))
        print lxml.etree.tostring(root)

prints me

<schema/>

What am I doing wrong?

Thanks in advance,
Alex
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