diff --git a/fcs-core-2.0/interface-specification.adoc b/fcs-core-2.0/interface-specification.adoc index f090b5d..b915a0d 100644 --- a/fcs-core-2.0/interface-specification.adoc +++ b/fcs-core-2.0/interface-specification.adoc @@ -62,7 +62,7 @@ The value of the `@id` attribute `MUST NOT` contain the characters `,` (comma) o * one `` element (`REQUIRED` if Endpoint supports _Advanced Search_ capability) + -A list of Layers that are generally supported by this Endpoint. This list is composed of one or more `` elements. The content of a `` `MUST` be the identifier of a Layer (see section <>), e.g. orth. Each `` element `MUST` carry an `@id` and a @result-id attribute. The value of the `@id` attribute is later used in the element to indicate, which Data View is supported by a resource (see below). The `@result-id` attribute is used in the Advanced Data View (see section <>). Each `` element `MAY` carry an optional `@qualifier` attribute. It is used as a qualifier in a FCS-QL search term in to address this specific layer. +A list of Layers that are generally supported by this Endpoint. This list is composed of one or more `` elements. The content of a `` `MUST` be the identifier of a Layer (see section <>), e.g. orth. Each `` element `MUST` carry an `@id` and a @result-id attribute. The value of the `@id` attribute is later used in the element to indicate, which Layer is supported by a resource (see below). The `@result-id` attribute is used in the Advanced Data View (see section <>). Each `` element `MAY` carry an optional `@qualifier` attribute. It is used as a qualifier in a FCS-QL search term in to address this specific layer. + This list `MUST NOT` include duplicate entries, i.e. no Layer with the same `@result-id` MIME type must appear more than once. +