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REST SPI Mappings for SOS Proxy Cache.

There is a newer version: 1.0.0-alpha.9

## Adding extra metadata fields

Adding extra metadata to each series can be done by creating an extra metadata table.
Apply `src/extension/metadata/create_metadata_table.sql` and add some metadata to it.
Add `/hbm/sos/metadata` to the `seriesSessionFactory` bean in
`WEB-INF/spring/series-database-config.xml` like
```

  
    classpath:hbm/sos/v42/*.hbm.xml
    classpath:hbm/sos/v42/series/*.hbm.xml
    classpath:hbm/sos/metadata/*.hbm.xml
  

```

Now configure the metadata extension to the Web interface so the data can be accessed.
Open the `api_v1_mvc.xml` add the bean
`org.n52.io.extension.DatabaseMetadataExtension` to the `metadataExtensions`
property of a parameterController.

For example
```
 
    
    
    
        
            
            
            
            
            
        
    

```

After restart you should be able to review the extra metadata available in the
`extras` property array of a timeseries. To access them just call
`api/v1/timeseries/:id/extras` and optionally filter by adding query parameter
`fields` (takes a comma-separated list of metadata names).