Reference Metadata attributeType - value discrepency with XML Schema

[agent96]

The XML schema for the Metadata Attribute has 1->many occurrences of Value (if it is used). The JSON Schema (if I am reading it correctly) supports only 1 value (i.e. it is not an array but a simple type such as string/integer/boolean or localised text).
The constructed samples for the sdmx-json have only single string values.

The supporting documentation in the XML schema for the Value is:

"Value holds any simple value (enumerated or not) for the metadata attribute. It can be repeated if this metadata attribute allows for multiple values"

The MSD supports multiple occurrences of an attribute.

Q) Is the intent to represented multiple occurrences of a value in sdmx-json as multiple attribute objects, each with the same ID and each reporting a single value? (I believe this is how SDMX 2.1 did it).

If so, the xsd should probably change to align.

If this is not the intent then the json schema needs to change to make the value an array of simple types / localised strings.

Either way, the format for XML and json seems to model the multiple occurrences in 2 different ways

[agent96]

Note - I think the json schema is correct, and the XML schema is incorrect. The reason being, the Attribute in the XSD describes the number of occurrences, this should be occurrences of the object, not the values - because each Object may have children.

Example:
|-CONTACT - value is a string (occurrences=1 to many)
|--NAME - contact name (only 1 allowed)

The Attribute CONTACT has multiple occurrences but this does not expect multiple values on each occurrence, the value in my example is used as an identifier. Each Contact only has 1 value and 1 child Attribute of Name (with 1 value).

This is also how SDMX 2.1 modelled it.

[dosse]

I agree, because each attribute value may have different children, the attribute needs to be repeated instead of allowing multiple values of one attribute instance.

[dosse]

As this is to be corrected in sdmx-ml moving this ticket to the other repo: sdmx-twg/sdmx-ml#36