| diagram |
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| namespace |
http://www.opengis.net/gml/3.2 |
| type |
gml:AbstractTimeSliceType |
| properties |
| content | complex | | substGrp | gml:AbstractGML | | abstract | true |
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| children |
gml:metaDataProperty gml:description gml:descriptionReference gml:identifier gml:name gml:validTime gml:dataSource |
| attributes |
| Name | Type | Use | Default | Fixed | annotation | | id | | required | | | | documentation | | The attribute gml:id supports provision of a handle for the XML element representing a GML Object. Its use is mandatory for all GML objects. It is of XML type ID, so is constrained to be unique in the XML document within which it occurs. |
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| annotation |
| documentation | To describe an event — an action that occurs at an instant or over an interval of time — GML provides the gml:AbtractTimeSlice element. A timeslice encapsulates the time-varying properties of a dynamic feature -- it shall be extended to represent a time stamped projection of a specific feature. The gml:dataSource property describes how the temporal data was acquired.
A gml:AbstractTimeSlice instance is a GML object that encapsulates updates of the dynamic—or volatile—properties that reflect some change event; it thus includes only those feature properties that have actually changed due to some process.
gml:AbstractTimeSlice basically provides a facility for attribute-level time stamping, in contrast to the object-level time stamping of dynamic feature instances.
The time slice can thus be viewed as event or process-oriented, whereas a snapshot is more state or structure-oriented. A timeslice has richer causality, whereas a snapshot merely portrays the status of the whole.
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