Abstract: The invention concerns a method and a device for accessing a spatio-temporal part of a video sequence of images compressed using a coding format implementing a prediction. The method comprises the steps of: defining a target spatial region corresponding to said spatio-temporal part to access; obtaining compressed data corresponding to a selection spatial region in at least one image of the video sequence, said selection spatial region including said target spatial region; obtaining at least one item of updating information for updating the selection spatial region that is provided for selecting compressed data in a following image of the video sequence, said updating information depending on the decoding of the compressed data corresponding to said target spatial region.

Abstract: Methods and devices for optimizing the processing of documents of the XML type comprising components are described. After having identified the required XML document and the processing mode that is to be performed on this document, for example forward or backward, the client sends a request comprising this information. On receipt of this request, the server accesses the document identified and the sequencing according to the processing mode that has to be performed before transmitting it. If the processing mode is of the backward type, it is not necessary to process all the document in order to transmit it, it may be transmitted gradually as sequencing takes place. The algorithms for sequencing and processing the components of an XML document are adapted to process the simple components and the components having circular references.