gml:DynamicFeatureCollection 

A gml:DynamicFeatureCollection is a feature collection that has a gml:validTime property (i.e. is a snapshot of the feature collection) or which has a gml:history property that contains one or more gml:AbstractTimeSlices each of which contain values of the time varying properties of the feature collection.  Note that the gml:DynamicFeatureCollection may be one of the following:
1.	A feature collection which consists of static feature members (members do not change in time) but which has properties of the collection object as a whole that do change in time .  
2.	A feature collection which consists of dynamic feature members (the members are gml:DynamicFeatures) but which also has properties of the collection as a whole that vary in time.

Element Information

Model

gml:metaDataProperty* , gml:description{0,1} , gml:descriptionReference{0,1} , gml:identifier{0,1} , gml:name* , gml:boundedBy{0,1} , gml:location{0,1} , gml:validTime{0,1} , gml:history{0,1} , gml:dataSource{0,1} , gml:dataSourceReference{0,1} , gml:dynamicMembers
Children: gml:boundedBy, gml:dataSource, gml:dataSourceReference, gml:description, gml:descriptionReference, gml:dynamicMembers, gml:history, gml:identifier, gml:location, gml:metaDataProperty, gml:name, gml:validTime

Attributes

QName Type Fixed Default Use Inheritable Annotation
gml:id ID required 
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.

Source 

<element name="DynamicFeatureCollection" type="gml:DynamicFeatureCollectionType" substitutionGroup="gml:DynamicFeature">
  <annotation>
    <documentation>A gml:DynamicFeatureCollection is a feature collection that has a gml:validTime property (i.e. is a snapshot of the feature collection) or which has a gml:history property that contains one or more gml:AbstractTimeSlices each of which contain values of the time varying properties of the feature collection. Note that the gml:DynamicFeatureCollection may be one of the following: 1. A feature collection which consists of static feature members (members do not change in time) but which has properties of the collection object as a whole that do change in time . 2. A feature collection which consists of dynamic feature members (the members are gml:DynamicFeatures) but which also has properties of the collection as a whole that vary in time.</documentation>
  </annotation>
</element>

Sample