T-SQL, how to parse this XML? - sql-server

Question

I've spent hours trying to parse this XML (bus stop schedule) and produce a recordset with , . Is there a way to convert XML to JSON, which I find is easier to handle?
Anyone willing to help? (Azure SQL Server)
<?xml version="1.0" encoding="UTF-8"?>
<Trias xmlns="http://www.vdv.de/trias" version="1.1">
<ServiceDelivery>
<ResponseTimestamp xmlns="http://www.siri.org.uk/siri">2021-11-25T17:52:12Z</ResponseTimestamp>
<DeliveryPayload>
<StopEventResponse>
<StopEventResult>
<StopEvent>
<ThisCall>
<CallAtStop>
<ServiceDeparture>
<TimetabledTime>2021-11-25T17:53:00Z</TimetabledTime>
<EstimatedTime>2021-11-25T17:53:00Z</EstimatedTime>
</ServiceDeparture>
</CallAtStop>
</ThisCall>
<Service>
<PublishedLineName>
<Text>58</Text>
<Language>de</Language>
</PublishedLineName>
</Service>
</StopEvent>
</StopEventResult>
<StopEventResult>
<StopEvent>
<ThisCall>
<CallAtStop>
<ServiceDeparture>
<TimetabledTime>2021-11-25T17:58:00Z</TimetabledTime>
<EstimatedTime>2021-11-25T17:58:00Z</EstimatedTime>
</ServiceDeparture>
</CallAtStop>
</ThisCall>
<Service>
<PublishedLineName>
<Text>60</Text>
<Language>de</Language>
</PublishedLineName>
</Service>
</StopEvent>
</StopEventResult>
</StopEventResponse>
</DeliveryPayload>
</ServiceDelivery>
</Trias>

Answer 1

A minimal reproducible example was not provided.
So shooting from the hip.
There is no need for any XML parsing. SQL Server comes with the built-in XQuery language support to handle XML data type.
The only nuance is that the input XML has namespaces.
A default namespace is declared by using XMLNAMESPACES() clause.
A couple of XQuery methods are in use: .nodes() and .value()
SQL
DECLARE #xml XML =
N'<Trias xmlns="http://www.vdv.de/trias" version="1.1">
<ServiceDelivery>
<ResponseTimestamp xmlns="http://www.siri.org.uk/siri">2021-11-25T17:52:12Z</ResponseTimestamp>
<DeliveryPayload>
<StopEventResponse>
<StopEventResult>
<StopEvent>
<ThisCall>
<CallAtStop>
<ServiceDeparture>
<TimetabledTime>2021-11-25T17:53:00Z</TimetabledTime>
<EstimatedTime>2021-11-25T17:53:00Z</EstimatedTime>
</ServiceDeparture>
</CallAtStop>
</ThisCall>
<Service>
<PublishedLineName>
<Text>58</Text>
<Language>de</Language>
</PublishedLineName>
</Service>
</StopEvent>
</StopEventResult>
<StopEventResult>
<StopEvent>
<ThisCall>
<CallAtStop>
<ServiceDeparture>
<TimetabledTime>2021-11-25T17:58:00Z</TimetabledTime>
<EstimatedTime>2021-11-25T17:58:00Z</EstimatedTime>
</ServiceDeparture>
</CallAtStop>
</ThisCall>
<Service>
<PublishedLineName>
<Text>60</Text>
<Language>de</Language>
</PublishedLineName>
</Service>
</StopEvent>
</StopEventResult>
</StopEventResponse>
</DeliveryPayload>
</ServiceDelivery>
</Trias>';
;WITH XMLNAMESPACES(DEFAULT 'http://www.vdv.de/trias')
SELECT c.value('(ThisCall/CallAtStop/ServiceDeparture/TimetabledTime/text())[1]', 'DATETIMEOFFSET(0)') AS TimetabledTime
, c.value('(ThisCall/CallAtStop/ServiceDeparture/EstimatedTime/text())[1]', 'DATETIMEOFFSET(0)') AS EstimatedTime
, c.value('(Service/PublishedLineName/Text/text())[1]', 'VARCHAR(100)') AS [Text]
, c.value('(Service/PublishedLineName/Language/text())[1]', 'CHAR(2)') AS [Language]
FROM #xml.nodes('/Trias/ServiceDelivery/DeliveryPayload/StopEventResponse/StopEventResult/StopEvent') AS t(c);
Output
+----------------------------+----------------------------+------+----------+
| TimetabledTime | EstimatedTime | Text | Language |
+----------------------------+----------------------------+------+----------+
| 2021-11-25 17:53:00 +00:00 | 2021-11-25 17:53:00 +00:00 | 58 | de |
| 2021-11-25 17:58:00 +00:00 | 2021-11-25 17:58:00 +00:00 | 60 | de |
+----------------------------+----------------------------+------+----------+