{ <data-ck> | // Wave samples <silence-ck> }... ) // Silence <silence-ck> → slnt( <dwSamples:DWORD> ) // Count of silent samplesThese productions are confused. Apparently <data-list> (undefined) and <wave-list> (defined but not referenced) should be identical. Even if that problem is fixed, the productions then allow a <data-ck> to contain a recursive <wave-data> (which implies data interpretation problems). The specification should have been something like: <wave-data> → { <data-ck> | <wave-list> } <data-ck> → data( <bSampleData:BYTE> ... ) <wave-list> → LIST( 'wavl' { <data-ck> | // Wave samples <silence-ck> }... ) // Silence <silence-ck> → slnt( <dwSamples:DWORD> ) // Count of silent samplesto avoid the recursion. WAV files can contain embedded IFF "lists", which can contain several "sub-chunks". Metadata As a derivative of RIFF, WAV files can be tagged with metadata in the INFO chunk. In addition, WAV files can embed any kind of metadata, including but not limited to Extensible Metadata Platform (XMP) data or ID3 tags in extra chunks. Applications may not handle this extra information or may expect to see it in a particular place. Although the RIFF specification requires that applications ignore chunks they do not recognize, some applications are confused by additional chunks. Popularity Uncompressed WAV files are large, so file sharing of WAV files over the Internet is uncommon except among video, music and audio professionals where the uncompressed form has become the most popular of all audio formats and, for most, high speed large bandwidth web connections are commonplace. Many audio and music software manufacturers now favour it as their default file format though others are often supported. The high resolution of the format makes it suitable for retaining first generation archived files of high quality, for use on a system where disk space is not a constraint, or in applications such as audio editing where the time involved in compressing and uncompressing data, and the losses in quality of such conversions are a concern. Use by broadcasters In spite of their large size, uncompressed WAV files are used by most radio broadcasters, especially those that have adopted a tapeless system. BBC Radio in the UK uses 48 kHz 16-bit two-channel WAV audio as standard in their SCISYS dira audio editing and playout system. The UK Commercial radio company Global Radio uses 44.1 kHz 16-bit two-channel WAV files in the Genesys playout system, and throughout their broadcast chain. The ABC "D-Cart" system, which