Aldec UCDB XML code coverage report, as Aldec's tool 'acdb2xml' exports a coverage database (ACDB) of Riviera-PRO or Active-HDL. Aldec publishes no schema. This one was reverse-engineered from reports of Riviera-PRO 2021.10 and 2022.04: every element and attribute these reports state is required, in their order, and no other is allowed. The kinds of scopes and bins and the source languages are the names the UCIS standard defines in its C API, without the prefix 'UCIS_'; a kind of bin without a name is stated by its value in hexadecimal: '1000000' is 'UCIS_BLOCKBIN'. Flags of scopes and bins are eight hexadecimal digits. An element states an attribute key once. The tool's name and version, e.g. 'Riviera-PRO 2022.04'. 1: a test, 2: a merge of coverage databases.