I t is stri ctly based on De scriptio n Logic. In addition to c la ss desc ri p-tion of par ame te rs it a lso a llo w s t he modelling of r el at ions be twe en pa rame - t e rs a nd t he prec ise de sc ript i on of the size of da ta to be supplied to a se r vic e. In parti cul a r, i t sol ves two ma jor is sues identi fie d withi n curre nt prop osals f or a Se manti c Web S e rvi ce annotatio n st anda rd. This shall be achi eve d by semantically annot ating web reso ur ces, i.e. el ements of the re sources are as so ci at ed with elements of onto logies. Under the auspices of the W 3C, a couple of language s tandards have bee n devel oped and widely accep te d: buil din g on the Resour ce Description Framework, RDF, [11], and th e RDF Sc hema language, [ 12], concepts and con cep t relations can be def ined in the W eb Ontol ogy Language OW L, [7 ]. However, the web also offers a ccess t o se rvices, i.e., W eb Ser vices.