add descriptive elements to WNM

[tomkralidis]

We have seen instances of WNM using properties.content.value to add descriptive text about a given granule/dataset. (properties.content.value should be used for inline data).

Add properties.title and properties.description as optional descriptive elements of a WNM. These elements align with WCMP2, OGC API - Records and STAC Common Elements.

[tomkralidis]

TT-WISMD 2024-10-25:

• need to determine whether these values are really describing something more applicable in WCMP2
• can add size to WNM
• keep metadata in WCMP2, not WNM
• we have additional properties capabilities already in WNM
• provide additional clarity for properties.content in clause 7

[josusky]

I have re-read the clause 1.15 Properties / Content in https://github.com/wmo-im/wis2-notification-message/blob/main/standard/sections/clause_7_normative_text.adoc and it seems pretty clear to me. May be we can add an "example" sub-sentence, let's say, changing the first sentence from:

The content property allows for the inclusion of data in the notification message when the length of the data, once encoded, is smaller than 4 096 bytes.

to:

The content property allows for the inclusion of data, e.g. a BUFR coded synoptic observation, in the notification message when the length of the data, once encoded, is smaller than 4 096 bytes.

[amilan17]

Maybe the clarification needs to be on the definition of data....