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Relationships between originals published on tangible media and remote electronic reproductions have necessitated the development of special conventions. A major reason for this is that retrospective digitization of past issues is generally anticipated, even if it hasn't already occurred.
In cases in which an earlier/later relationship is combined into a 776 link between print and electronic versions (i.e., when a print resources ceases, but continues online), CONSER uses specific wording in subfield |i to reflect this (see CCM 14.5.4):
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Chronological or numeric designations may be combined with labels in subfield |i when the relationship described only applies to specific parts or a specific span of the other manifestation. (CONSER opted to use subfield |i instead of the normal subfield |g for this information in this case to create clearer displays for users.)
For example:
776 08 |i Print version, 1899-2016:
530 field: Additional physical form available note
CONSER catalogers generally only use a 530 note when there is no English-language-of-cataloging OCLC record to which to link. Linking fields are preferred whenever possible because of the possible functionality of ISSNs in subfield |x, etc. Catalogers use text in subfield |i to record any complex details about a particular relationship. To avoid redundancy, generally 530 fields are not used when linking fields are employed to express the same relationship.