What is the state of adoption for WSDL 2.0 and WSDL HTTP Binding?

Question

Hi,

1) does anyone know something about the adoption rate of WSDL 2.0?

I always read that it is not widely deployed compared to WSDL 1.1 but I can't find any numbers or surveys on this.

2) And how relevant is the HTTP Binding in WSDL? How many real-world projects actually use it?

It has been significantly improved in the WSDL 2.0 spec but all I keep finding is that WSDL 2.0 still has a low rate of adoption.

I would really appreciate if someone could point me to any reliable source that has some concrete numbers on this.

Thanks in advance, Max

UPDATE: Until now the only numbers I was able to find were the number of results for specific Google queries...

WSDL 2.0 filetype:wsdl description interface endpoint -> 29 results

WSDL 1.1 filetype:wsdl definitions porttype -> About 9,100 results

EDIT: Changed the title to make the intent of the question more clear.

Answer 1

It seems like it has no concrete numbers because everybody is still in the "talking about it" phase. Even the Wikipedia page has a "disputed" statement about the poor WSDL 2.0 support in SDKs.

Answer 2

When in doubt, remember that WSDL 1.x has like 7 yr of historical advantage and that it took 5-6 for it to reach the status of universally present and trusted. So, give WSDL 2.x another 5 yr :-) or at least till you see .NET CLR and VS supporting it - as in you make new project point to a WSDL 2.0 URL and you have C# code and buildable and runnable app. .NET 4.0 doesn't support is => another 2-3 years.

Auto-generated code is pretty much the only serious issue. Clients that just send requests and interpret result on their own (grab values from HTML tags - including AJAX) are not going to notice any diff since they don't really use WSDL.