I have dug through C4::AuthoritiesMarc::BuildSummary and, if I understand well, what on-line help says on summary:
>> The summary contains an "ISBD" like description to explain how the entry must be shown in the result list. The syntax is :
* [xxxFFFSyyy] where are up to 3 digits BEFORE the field, FFF the field number, S the subfield code, yyy up to 3 digits AFTER the field.
* things outside  are kept as is (including HTML)
* repeatable fields are managed. <<
is relevant for UNIMARC authorities *ONLY*. For MARC21 the content of the summary field, taken as string, will just precede the summary constructed by the function. Am I right? If so then I think this remark should be in the help file not to confuse users.
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The attachment has been added here by mistake. I am sorry -- I do not know how to erase it...
Hi Janusz, could you give an example we could use in the manual? I am not sure what xxx and yyy would be.