Errata exists for this version of the document.
In some cases Servers are required to return the first available data point for a historical Node; Clause A.2 recommends the way that a Client should request this information so that Servers can optimize this call, if desired. Although there are multiple calls that could return the first data value, the recommended practice will be to use the StartOfArchive Property.
If this Property isn’t available then use one of the following queries using ReadRawModifiedDetails parameters:
returnBounds=false
numValuesPerNode=1
startTime=DateTime.MinValue+1 second
endTime= DateTime.MinValue
Or:
returnBounds=false
numValuesPerNode=1
startTime=DateTime.MinValue
endTime= DateTime.MaxValue
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