Difference between Web Services 1.0 standard from 2004 and the 1.1 standard from 2006

I have to create some webservices based applications with compatibility for both the 1.0 and 1.1 versions.
Though i did a analysis with the documents from the OASIS website i ws not able to infer much from them.
Any help in this matter is welcome

Which standard are you referring to? There is no one "web services standard"; rather there are a whole bunch of standards related to one another: SOAP, WSDL, WS-Security, UDDI, WS Basic Profile, BPEL, ...

To be more precise ,I am referring to the WS-Security standards.

WS-Sec 1.1 is backwards compatible with 1.0, so supporting 1.1 should be sufficient. From the schema I see that there are new elements called "SignatureConfirmation" and "EncryptedHeader"; those must be for new functionality.

I checked the schema for 1.1 at http://docs.oasis-open.org/wss/v1.1/oasis-wss-wssecurity-secext-1.1.xsd
and found that the namespace wsse has been changed to tns but i see a pretty small schema with the two elements mentioned EncryptedData and SignatureConfirmation.
Can i get a complete 1.1 version schema some where the 1.0 version elements have been incuded ie the 1.1 is built over the 1.0 schema

The 1.1 schema includes the 1.0 one, so everything that was in 1.0 also is in 1.1.

Since 1.1 supports 1.0 also ,in case while verifying the incoming message wont there would be any namespace collisions.

If I am correct the namespace xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"

has been replaced by
xmlns:tns='http://docs.oasis-open.org/wss/oasis-wss-wssecurity-secext-1.1.xsd'

So do i have to check the namespaces everytime and then continue my verification process?