Provide a serde deserializer.

[leoschwarz]

Other than how to annotate the paths for every instance I think it might be really nice if there was an easy way to integrate this code with serde. One downside is that it might make the implementation a bit opinionated, but the current APIs for parsing in general are and always offer the possibility to read a string and then do it yourself, so I guess it should not be a problem either.

Probably the only actual problem is how to annotate the XPath?

[leoschwarz]

This could be done mostly with serde serde(rename = "xpath") attributes.

The main remaining question is how to connect FromXml and Deserialize.

[leoschwarz]

One thing that would be interesting here as well is how well this could be integrated with existing serde XML crates.