Issue: xsi:nil="true" not serialized correctly in output XML

[irisfield]

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• Have you checked the docs for helpful APIs and examples?

Description

This is related to #123. I am also trying to serialize JSON to XML to make requests to a SOAP API. I need a way to add the attribute xsi:nil="true" to the serialized XML. I am getting an unexpected output.

Input

const xmlBuilder = new XMLBuilder({
  attributeNamePrefix: '@',
  ignoreAttributes: false,
  suppressEmptyNode: true,
  format: true,
});

const output = xmlBuilder.build({
  "Family": "",
  "Genus": "Iris",
  "Subgenus": { "@xsi:nil": "true" },
  "Species": "Bracteata",
})

Output

<Family/>
<Genus>Iris</Genus>
<Subgenus xsi:nil/>
<Species>Bracteata</Species>

expected data

<Family/>
<Genus>Iris</Genus>
<Subgenus xsi:nil="true"/>
<Species>Bracteata</Species>

Observation

When I set "@xsi:nil" to anything but "true" or true it works as expected. For example:

const output = xmlBuilder.build({
  "Family": "",
  "Genus": "Iris",
  "Subgenus": { "@xsi:nil": "false" },
  "Species": "Bracteata",
})

outputs:

<Family/>
<Genus>Iris</Genus>
<Subgenus xsi:nil="false"/>
<Species>Bracteata</Species>

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[irisfield]

I found the solution. The suppressBooleanAttributes option must be set to false:

Input

const xmlBuilder = new XMLBuilder({
  attributeNamePrefix: '@',
  ignoreAttributes: false,
  suppressEmptyNode: true,
  suppressBooleanAttributes: false,
  format: true,
});

const output = xmlBuilder.build({
  "Family": "",
  "Genus": "Iris",
  "Subgenus": { "@xsi:nil": "true" },
  "Species": "Bracteata",
})

Output

<Family/>
<Genus>Iris</Genus>
<Subgenus xsi:nil="true"/>
<Species>Bracteata</Species>