I have been tasked with writing an xsd, for an xml file format that my company has created.

Unfortunately one of the tags contains two variables, here is an example of the tag

```
<to_1.1.1.0_24>

```

The 1.1.1.0 is an ip address and as such can change, and the 24 is the netmask. 
Is there anyway of expressing this within an xsd document.

Many Thanks

David