A user pointed out on the Project Chat ([[https://www.wikidata.org/wiki/Wikidata:Project_chat#Your_data_isn't_rdfxml? | link]], [[ https://www.wikidata.org/w/index.php?title=Wikidata:Project_chat&oldid=1180906455#Your_data_isn't_rdfxml? | permalink ]]) that the current RDF exports are not valid RDF.
Specifically, running the following code (with rdflib 4.2.2):
```
G = rdflib.Graph()
G.load('https://www.wikidata.org/wiki/Special:EntityData/Q42.rdf')
```
produces the error
```
rdflib.exceptions.ParserError: https://www.wikidata.org/wiki/Special:EntityData/Q42.rdf:5125:2: rdf:nodeID value is not a valid NCName: 3d66a9a972a16b3583effd41e5f2aff4
```
The RDF specification states that [[https://www.w3.org/TR/rdf-syntax-grammar/#nodeIdAttr | a nodeID should have type rdf-id]], [[https://www.w3.org/TR/rdf-syntax-grammar/#rdf-id | rdf-id is equivalent to NCName]], and NCNames cannot start with numbers.
It seems that prepending a letter should fix this issue.