Allow passing string as element name

[highsource]

See tomkralidis/csw4js#1.

Currently element references require an object like this:

{
        "namespaceURI": "http://www.opengis.net/cat/csw/2.0.2",
        "localPart": "GetRecords",
        "prefix": "csw"
}

This is too verbose. If the csw prefix is already defined, then it should be enough to write

'csw:GetRecords'

instead. Or '{http://www.opengis.net/cat/csw/2.0.2}GetRecords' or '{http://www.opengis.net/cat/csw/2.0.2}csw:GetRecords'.

Good question what to do on unmarshalling. Return string? Or object like now? Or have an option to switch it? Which namespace prefix to use?

[tomkralidis]

+1 for allowing option.

[highsource]

@tomkralidis Yes, option is probably the safest. Backwards compatibility and so on.

[highsource]

Started the documentatione here:

https://github.com/highsource/jsonix/wiki/Qualified-Names