OnlineResource attributes are missing xlink-namespace

Hi,

The atttributes of net.opengis.wms.v_1_1_0.OnlineResource and net.opengis.wms.v_1_1_1.OnlineResource (xmlnsXlink, xlinkType, xlinkHref) are missing the namespace-parameter in @XmlAttribute. At the moment it looks e.g. like this:

```
@XmlAttribute(name = "xlink:href", required = true)
@XmlJavaTypeAdapter(NormalizedStringAdapter.class)
protected String xlinkHref;
```

but it needs to be something like this:

```
@XmlAttribute(name = "href", namespace = "http://www.w3.org/1999/xlink", required = true)
@XmlJavaTypeAdapter(NormalizedStringAdapter.class)
protected String xlinkHref;
```

Best regards,
Gerd