XML Node Time-Limited Modification Server Restoration
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Solution Overview
Problem
Existing mechanisms for time-limited modifications of XML documents in XCAP systems require complex functionality in clients and may result in unintended permanent changes if the client fails before the expiration time, leading to erroneous data retention.
Innovation Solution
A method and system that enable time-limited modifications of XML nodes by storing the current version of the node on the server, modifying it according to client requests with a specified expire time, and automatically restoring the previous version when the time expires, allowing for timer re-setting with subsequent requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the client performs time limited modifications by staying on line and waiting for expiration, then the modification can be restored to previous content, but the client must repeat update steps and manage complex functionality to ensure proper restoration
Solution Approach 1:
The server automatically restores the XML node to its previous version when the expiration time elapses, without requiring the client to perform any additional operations. The server monitors the expiration time and autonomously reverses the modification, eliminating the need for complex client-side logic to manage restoration.
Solution Approach 2:
The server stores the previous version of the XML node before applying the time-limited modification. This preliminary action of saving the original state enables automatic restoration later without requiring the client to re-transmit previous content or manage restoration logic.
2Adaptability or versatility
If the client sends modification requests continuously to maintain updates, then the modification can be extended or renewed, but the client must remain on line and wait for expiration to repeat updates
Solution Approach 1:
The server provides feedback to the client about the expiration status of the modification through SIP Notify messages. This feedback mechanism allows the client to understand when the modification will expire and can plan accordingly, while the server automatically handles the restoration process.
Solution Approach 2:
The server monitors the expiration time periodically and automatically restores the XML node when the time elapses. This periodic monitoring eliminates the need for the client to continuously check or wait actively, as the server handles the timing and restoration autonomously.
3Reliability
If the client fails to send updates before expiration, then the modification should be restored automatically, but erroneous permanent changes may occur if the client runs out of battery or is switched off
Solution Approach 1:
The server prepares for client failure by storing the previous version of the XML node before applying the time-limited modification. This cushioning of the original state enables automatic restoration even if the client fails to send updates or disconnects, preventing erroneous permanent changes from occurring.
Solution Approach 2:
The server autonomously monitors the expiration time and restores the XML node automatically, independent of client status. This self-service capability ensures that even if the client runs out of battery or is switched off, the modification will be restored without requiring client intervention, preventing data integrity issues.
Data Source
AI summary
A method, a server and a client for enabling time limited modifications of XML nodes in XML documents, where a modified document can be restored to its original content upon expiry of an expire time, which has been specified for the modification, are provided. A request for a time limited modification of an XML node, including an expire time, is transmitted from a client to a server. At the server, a timer is either started, in case no timer is pending for the XML node, or re-set, in case a timer is already pending for the XML node. The present version of the XML node is stored, before it is modified, according to modification data provided in the request. Upon timer timeout the requested modification will no longer be valid, and therefore the XML node is restored to its stored version of the XML node.