| http://www.w3.org/ns/prov#value | - Yes, ???In Switzerland, this type of contractual provision is an element of the well-established and widely used standard form contract (the SIA 118 1977/91) where it is referred to as ???R??ckbehalt??? (retention)??? ???The retention amounts to 10% of the service value at the end of the accounting period ??? If the service value, however, exceeds CHF 300,000, the retention amounts to 5% of the va
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