The M4 file format has been in use since 2013. It is an XML file format with a header and detail sections, and has an XSD to define its format requirements. Similar to Minimon files, header section contains metadata about the site and time period of data collection. It was built primarily to store and transmit data from the M4 interrogation software, which parses each message from a transceiver and assigns it a message type. Status messages from transceivers are stitched together into one long message, rather than being transmitted line by line. Time stamps using the date time offset data type were introduced with this file format, allowing times to be recorded in local time instead of Pacific Standard Time.

Schema InterrogationDataSet.xsd

schema location:	https://ptagis.org/content/schemas/interrogation/M4v2/InterrogationDataSetV2.xsd
attributeFormDefault:	qualified
elementFormDefault:	qualified
targetNamespace:	http://ptagis.org/InterrogationDataSet.xsd

Elements

InterrogationDataSet

element InterrogationDataSet

diagram
properties	content  complex
identity constraints	Name   Refer   Selector   Field(s)   Annotation unique   MessageData_Constraint1      .//mstns:MessageData   mstns:MessageKey   mstns:FileTitle   unique   Constraint1      .//mstns:FileSubmission   mstns:FileTitle

element InterrogationDataSet/FileSubmission

diagram
properties	content  complex

element InterrogationDataSet/FileSubmission/FileTitle

diagram
type	restriction of xs:string
properties	content  simple
facets	Kind  Value  Annotation maxLength  50

element InterrogationDataSet/FileSubmission/FileCreated

diagram
type	restriction of xs:dateTime
properties	content  simple

element InterrogationDataSet/FileSubmission/SiteCode

diagram
type	restriction of xs:string
properties	content  simple
facets	Kind  Value  Annotation maxLength  3

element InterrogationDataSet/FileSubmission/SiteLastModified

diagram
type	xs:dateTime
properties	content  simple

element InterrogationDataSet/FileSubmission/MachineName

diagram
type	restriction of xs:string
properties	content  simple
facets	Kind  Value  Annotation maxLength  50

element InterrogationDataSet/FileSubmission/ProgramVersion

diagram
type	restriction of xs:string
properties	content  simple
facets	Kind  Value  Annotation maxLength  50

element InterrogationDataSet/FileSubmission/DataRole

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  25

element InterrogationDataSet/FileSubmission/PtagisUserId

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  255

element InterrogationDataSet/FileSubmission/FileClosed

diagram
type	restriction of xs:dateTime
properties	content  simple

element InterrogationDataSet/FileSubmission/MessageData

diagram
properties	minOcc  0 maxOcc  unbounded content  complex
annotation	appinfo <msdata:Relationship name="FileSubmission_MessageData" msdata:parent="FileSubmission" msdata:child="MessageData" msdata:parentkey="FileTitle" msdata:childkey="FileTitle" msprop:Generator_UserChildTable="MessageData" msprop:Generator_ChildPropName="GetMessageDataRows" msprop:Generator_UserRelationName="FileSubmission_MessageData" msprop:Generator_ParentPropName="FileSubmissionRow" msprop:Generator_RelationVarName="relationFileSubmission_MessageData" msprop:Generator_UserParentTable="FileSubmission"/>

element InterrogationDataSet/FileSubmission/MessageData/MessageKey

diagram
type	xs:int
properties	content  simple

element InterrogationDataSet/FileSubmission/MessageData/TimeStamp

diagram
type	restriction of xs:dateTime
properties	content  simple

element InterrogationDataSet/FileSubmission/MessageData/MessageTypeVal

diagram
type	restriction of xs:string
properties	content  simple default  None
facets	Kind  Value  Annotation maxLength  255

element InterrogationDataSet/FileSubmission/MessageData/MessageText

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  4000

element InterrogationDataSet/FileSubmission/MessageData/AntennaGroup

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  255

element InterrogationDataSet/FileSubmission/MessageData/TransceiverId

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  2

element InterrogationDataSet/FileSubmission/MessageData/AntennaId

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  2

element InterrogationDataSet/FileSubmission/MessageData/TransceiverBufferTimeStamp

diagram
type	xs:dateTime
properties	minOcc  0 maxOcc  1 content  simple

element InterrogationDataSet/FileSubmission/MessageData/SbycActionTypeVal

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  255

element InterrogationDataSet/FileSubmission/MessageData/SbycActionCode

diagram
type	xs:int
properties	minOcc  0 maxOcc  1 content  simple

element InterrogationDataSet/FileSubmission/MessageData/SbycGateActionTypeVal

diagram
type	restriction of xs:string
properties	minOcc  0 maxOcc  1 content  simple
facets	Kind  Value  Annotation maxLength  255

element InterrogationDataSet/FileSubmission/MessageData/SbycProcessLatency

diagram
type	xs:decimal
properties	minOcc  0 maxOcc  1 content  simple

element InterrogationDataSet/FileSubmission/MessageData/FileTitle

diagram
type	restriction of xs:string
properties	content  simple
facets	Kind  Value  Annotation maxLength  50

XML Schema documentation generated by XMLSpy Schema Editor http://www.altova.com/xmlspy