Claus Ibsen created CAMEL-25325:
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Summary: camel-datasonnet - XML elements that appear once vs
several times, and leaked ~/$ keys
Key: CAMEL-25325
URL: https://issues.apache.org/jira/browse/CAMEL-25325
Project: Camel
Issue Type: Improvement
Reporter: Claus Ibsen
Reading XML in DataSonnet:
* A repeated element comes through as an array when there are several and as an
object when there is one. {{<Items><Item/></Items>}} gives {{Item: \{...\}}}
but two Items give {{Item: \[...\]}}. A mapping such as {{std.map(function(i)
i\['@sku'\], body.Order.Items.Item)}} works on a test message with two items
and fails in production with one: "Wrong parameter type: expected Array, got
object". This is a very common mistake for people and AI models alike, and the
docs give no guidance.
* XML conversion adds keys for element order ({{~}}) and text ({{$}}, {{$1}},
... for mixed content). When part of an XML document is mapped straight to
JSON, those keys end up in the output, e.g. {{\{"@sku":"x","$":"2","~":1\}}}.
Proposal:
* Add helpers to camel.libsonnet, e.g. {{c.asArray(x)}} (null gives [], an
object gives [object], an array stays as is) and something to strip the
{{~}}/{{$}} keys or turn {{$}} into a value.
* Add a section to the datasonnet-language doc on reading XML: attributes
{{\['@id'\]}}, text {{\['$'\]}}, one vs many, and the leaked keys, with
examples.
* Use {{c.asArray}} when translating DataWeave {{.*}} (see the related
DataWeave issue).
_Claude Code on behalf of davsclaus_
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