1. Yes, all delimiters allowed 2. No restriction on the encoding of such delimiters 3. Escape schemes only apply to text representation The dfdl:escapeSchemeRef property only appears in section 13.2 Properties Common to All Simple Types with Text representation. When creating a DFDL schema that involves delimited binary data, you have to be careful that your data can't contain any bytes that match any in-scope delimiter. I believe that IBM DFDL's byte scanner converts in-scope delimiters into the equivalent bytes using the dfdl:encoding of the object, then matches the bytes. Regards Steve Hanson IBM Hybrid Integration, Hursley, UK Architect, IBM DFDL Co-Chair, OGF DFDL Working Group smh@uk.ibm.com tel:+44-1962-815848 mob:+44-7717-378890 From: Mike Beckerle <mbeckerle.dfdl@gmail.com> To: "dfdl-wg@ogf.org" <dfdl-wg@ogf.org>, Josh Adams <jadams@tresys.com> Date: 08/11/2017 13:49 Subject: [DFDL-WG] delimited binary data - clarifications Sent by: "dfdl-wg" <dfdl-wg-bounces@ogf.org> Daffodil project is implementing various packed formats, and looking at the TLOG schema on the DFDL Schemas site. The DFDL spec is clear that lengthKind delimited is allowed for packed formats (all variants of packed) and hexBinary. My question is whether there is any restriction on the generality of this that was intended, but not stated in the spec, where we should be issuing a clarification. E.g., 1. Can binary data have all of initiators, terminators, and separators? 2. Is there a restriction on the charset encoding used to specify these, e.g., SBCS? Or do the byte patterns being used to scan for these require conversion of the specified delimiter to bytes from any supported encoding? 3. Do escape schemes apply to delimited binary? If, in fact, all these things are allowed, then I believe we should add a one-liner to section 12.3.2.2 specifying that all aspects of delimited parsing including the above, are specifically allowed. -- dfdl-wg mailing list dfdl-wg@ogf.org https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ogf.org_mailman_listinfo_dfdl-2Dwg&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=AJa9ThEymJXYnOqu84mJuw&m=R0T7EfuN11XJCtCsg2SR2uygmOXAvBpa2q-Z5aWuazM&s=-ryCrn-ycFskwbf9Uv-Ewr56JAk2s4vV7T0uyCE088U&e= Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU