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Application or web services are increasingly being used
across organisational boundaries. Moreover, new services
are being introduced at the network and storage level. Languages
to specify interfaces for such services have been researched
and transferred into industrial practice. We investigate
end-to-end quality of service (QoS) and highlight
that QoS provision has multiple facets and requires complex
agreements between network services, storage services
and middleware services. We introduce SLAng, a language
for defining Service Level Agreements (SLAs) that accommodates
these needs. We illustrate how SLAng is used to
specify QoS in a case study that uses a web services speci-
fication to support the processing of images across multiple
domains and we evaluate our language based on it.
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