fails to serialize graphs containing some IRIs to xml

[trapperkeeper]

The issue appears to have a problem with IRIs with the format:

scheme://domain/path/id

when the 'id' portion is numerical (or it might just fail if it starts with a number?).

For example, https://endlessforms.info/gdo/0000240

When serializing a graph with IRIs like the above, I get these errors:

ValueError: Can't split 'https://endlessforms.info/gdo/0000240'
ValueError: This graph cannot be serialized to a strict format because there is no valid way to shorten https://endlessforms.info/gdo/0000240

If I change my output format to Turtle, it works. But there are other parts of my pipeline that are expecting xml and I'd rather not be constantly switching between formats.

[trapperkeeper]

I validated the offending IRIs in a URI validator, it said that they are valid (just making sure).

[trapperkeeper]

I think I see the issue. While those are valid IRIs, the property IRIs cannot be shortened to the form gdo:0000240 in the XML. The "local part" of a prefixed xml qname must start with a letter. So, it is the XML specification that is causing these to fail.