Archive 2.x:CRUD: Update/2.1

The CRUD: Update Web service is used to update a published revision of an instance record. It is also used to create new (unpublished) revisions of an instance record. These unpublished, more recent, revisions would be potential future published revisions of the instance record.

Developers communicate with the CRUD: Update Web service using the HTTP POST method. You may request any content type (*/*). '''No content is returned by the Web service endpoint if the endpoint successfully executed the query. Only a "200 OK" message will be returned in the header.'''

Version
This documentation page is used for the version 2.1 of this endpoint. Check at the top of this page to see the documentation pages for the other versions of this endpoint.

Usage
This Web service is intended to be used by any user that wants to update the published revision of an instance record. The update of a record is performed by two atomic actions: delete and create. All records described within the input RDF document will get updated on the system. For each of them, the Crud Update web service will remove all the triples we have defined for them in the target dataset, and then will re-insert the new ones.

Every time this web service endpoint is called, a new revision can be created in the revisions graph of the dataset where the record is getting indexed. The status of this revision is determined by the  parameter of the endpoint. If the  stage specified in the query is not   then a revision will be created, but the actual record won't be updated in the dataset. If the  stage is   then the endpoint ensure that the previous latest revision is currently published, and then it will update the record in the dataset, and create a revision for that record in the revisions graph.

If the  parameter is   then the record will be updated in the dataset, but no revision will be created in the revision graph and the currently revision marked as   won't be updated neither. This means that is that if a revision for that record is re-published, then these unrevisioned changes will be lost.

It also update possible reification statements. All the reification statements are saved in the revisions records.

Warning: if your RDF document contains blank nodes and that you try to update them using the CRUD: Update web service endpoint, this will results in the creation of a new set of resources with new blank nodes URIS. This means that resources specified as blank nodes can't be updated using this web service endpoint. The best practice is not using blank nodes.

Configuration
Here are a few things you can configure to change the behavior of a CRUD: Update web service endpoint.

Geo-Enable
You can geo-enable the CRUD: Update web service endpoint. By geo-enabling the service, you will change the behavior of the endpoint such that if it detects that a record that is being indexed has geo-related information, then it will properly index that information such that other geo-enabled services, such as the Search web service endpoint, can leverage that information to perform different geo-related tasks.

Also read that other zWiki page that tells you how to geo-enabled a record description: Geo-enabling Datasets

To geo-enable a CRUD: Update web service endpoint you have to make sure that:


 * 1) The Solr instance is using the the Solr Spatial Query fix, and read this introduction article for good background information about this topic: Location-aware search with Apache Lucene and Solr
 * 2) The Solr instance is using the   schema
 * 3) The network.ini configuration file specify that the structWSF instance is geo-enabled by specifying   in the   section

Web Service Endpoint Information
This section describes all you permissions you need in the WSF (Web Service Framework) to send a query to this Web service endpoint, and it describes how to access it.

To access this Web service endpoint you need the proper CRUD (Create, Read, Update and Delete) permissions on a specific graph (dataset) of the WSF. Without the proper permissions on this graph you won't be able to send any queries to the endpoint.

Needed registered CRUD permission:


 * Create: False
 * Read: False
 * Update: True
 * Delete: False

As shown on the graph URI:


 * URI of the dataset where the instance record is indexed

Here is the information needed to communicate with this Web service's endpoint. Descriptions of the parameters are included below.

''Note: if a parameter has a default value, the requester can omit it and the default value will be used. Also, some baseline Web services may not offer other values than the default.''

HTTP Method:


 * POST

Possible "Accept:" HTTP header field value:



URI:


 * http://[...]/ws/crud/update/ ?document=param1&mime=param2&dataset=param3&lifecycle=param4&revision=param5&registered_ip=param6&interface=param7

URI dynamic parameters description:

Note: All parameters have to be URL-encoded


 * param1. RDF document where instance record(s) to update are described. The size of this document is limited to 8MB
 * param2. Mime type of the RDF document specified in the  parameter. One of:
 * application/rdf+xml — RDF document serialized in XML
 * application/rdf+n3 — RDF document serialized in N3


 * param3. Dataset URI where to update the indexed the RDF document
 * param4. Publication lifecycle stage of the record. One of:
 * published (default)
 * archive
 * experimental
 * pre_release
 * staging
 * harvesting
 * unspecified
 * param5 Specify if we want to create a new revision or not for the updated record. One of:
 * true (default)
 * false
 * param6. Target IP address registered in the WSF
 * param7. Source interface used for this web service query. The interface is a different way to process a query (different algorithms, different data management system, etc. The default interface is 'default'

Available Sources Interfaces
A source interface is a way to process a web service query. Different sources interfaces can be implemented for the same structWSF web service endpoint. Each interface will process the query differently, but all the queries to the web service endpoint will be the same, at the exception of the  parameter. Each interface shares the same API (the one defined by the web service endpoint), but their processing may differ (like using different algorithms, using different data management systems, etc.)

This is a list of the core interfaces for this endpoint. Organizations that hosts a structWSF network could create their own interface and make it available to the users. However such private source interface won't be part of this list, but should be publicized by the organization.

Query Answer from the Endpoint
If the query is successfully performed by the endpoint (i.e., the Web service resource has been properly created, updated or deleted), the endpoint will return the HTTP status message "200 OK" with an empty body. If an error occured, one of the HTTP status messages with the description of the error message in the body of the HTTP query will be returned.

HTTP Status Codes
Here are the possible HTTP status (error) codes returned by this Web service endpoint.

On error code and the specific error, a different message description can be issued (meaning a different error has been returned).


 * Code: 200
 * Message: OK


 * Code: 400
 * Message: Bad Request
 * Message description: No RDF document to index
 * Message description: No dataset specified
 * Message description: Unknown MIME type for this RDF document
 * Message description: Error #crud-update-100. Syntax error in the RDF document: XYZ
 * Message description: No unique identifier specified for this dataset
 * Message description: No target dataset
 * Message description: No Web service URI available
 * Message description: Target Web service XYZ not registered to this Web Services Framework
 * Message description: No access defined for this requester IP XYZ, dataset (XYZ) and Web service (XYZ)
 * Message description: The target Web service (XYZ) needs create access and the requested user (XYZ) doesn't have this access for that dataset (XYZ)
 * Message description: The target Web service (XYZ) needs read access and the requested user (XYZ) doesn't have this access for that dataset (XYZ)
 * Message description: The target Web service (XYZ) needs update access and the requested user (XYZ) doesn't have this access for that dataset (XYZ)
 * Message description: The target Web service (XYZ) needs delete access and the requested user (XYZ) doesn't have this access for that dataset (XYZ)


 * Code: 406
 * Message: Not Acceptable
 * Message description: Unacceptable mime type requested


 * Code: 500
 * Message: Internal Error