xml2rfc

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Describe the issue

$ xml2rfc --version
xml2rfc 3.12.2
$ echo '<rfc/>' > minimal.xml
$ xml2rfc minimal.xml
minimal.xml(1): Error: Expecting an element , got nothing, at /rfc

The name of the missing element is missing. The error message should show which element is missing at this location. (The odd spacing around the comma appears to indicate a name was intended to be included here.)

Note that the version I'm running is based on sudo apt install xml2rfc on an Ubuntu machine.

Code of Conduct

• [X] I agree to follow the IETF's Code of Conduct

xml2rfc make use of lxml for XML parsing. This looks like an error upstream issue in lxml.

Following Python script:

from io import StringIO
from lxml import etree


f = StringIO("""
    <element name="foo" xmlns="http://relaxng.org/ns/structure/1.0">
        <oneOrMore>
            <element name="bar">
                <text />
            </element>
        </oneOrMore>
    </element>""")

relaxng_doc = etree.parse(f)
relaxng = etree.RelaxNG(relaxng_doc)

valid = StringIO('<foo/>')
tree = etree.parse(valid)

try:
    relaxng.assertValid(tree)
except Exception as e:
    print(e.error_log)

generates following output:

<string>:1:0:ERROR:RELAXNGV:RELAXNG_ERR_NOELEM: Expecting an element , got nothing