SPARQL query result XML serialization misses 0.0 decimal values #3138
Description
Hi,
I'm using rdflib version 7.1.4.
If I serialize a SPARQL query result that includes the decimal value 0.0 using results.serialize(format="xml"), the XML output is missing the literal value.
It is working as expected for the other formats, but not for XML.
See below minimal working example.
from rdflib import Graph, Namespace
turtle_string = """
@prefix ex: <http://example.org/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
ex:item1
a ex:Item ;
ex:name "Smartphone" ;
ex:price 0.0 ;
.
"""
g = Graph()
g.parse(data=turtle_string, format="turtle")
results = g.query(
"""
SELECT ?item ?name ?price
WHERE {
?item
a ex:Item ;
ex:name ?name ;
ex:price ?price ;
.
}
""",
initNs={"ex": Namespace("http://example.org/")},
)
formats = ["csv", "json", "txt", "xml"]
for format_type in formats:
result = results.serialize(format=format_type).decode("utf-8")
contains_zero = "0.0" in result
print(f"{format_type}: Contains '0.0': {contains_zero}\n")
print(f"````{format_type}\n{result}\n````\n")Output:
csv: Contains '0.0': True
item,name,price
http://example.org/item1,Smartphone,0.0
json: Contains '0.0': True
{"results": {"bindings": [{"item": {"type": "uri", "value": "http://example.org/item1"}, "name": {"type": "literal", "value": "Smartphone"}, "price": {"type": "literal", "value": "0.0", "datatype": "http://www.w3.org/2001/XMLSchema#decimal"}}]}, "head": {"vars": ["item", "name", "price"]}}txt: Contains '0.0': True
item | name | price
------------------------------------------------------------------------------------------
<http://example.org/item1>|"Smartphone"|"0.0"^^<http://www.w3.org/2001/XMLSchema#decimal>
xml: Contains '0.0': False
<?xml version="1.0" encoding="utf-8"?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#" xmlns:xml="http://www.w3.org/XML/1998/namespace"><head><variable name="item"></variable><variable name="name"></variable><variable name="price"></variable></head><results><result><binding name="item"><uri>http://example.org/item1</uri></binding><binding name="name"><literal>Smartphone</literal></binding><binding name="price"><literal datatype="http://www.w3.org/2001/XMLSchema#decimal"></literal></binding></result></results></sparql>