Values of this type denote a zettel identifier.
Allowed values
Must be a sequence of 14 digits (0–9).
Query comparison
Search values with more than 14 characters are truncated to contain exactly 14 characters.
When the search operators less, not less, greater, and not greater are given, the length of the search value is checked. If it contains less than 14 digits, zero digits (0) are appended, until it contains exactly 14 digits.
All other comparisons assume that up to 14 characters are given.
Comparison is done through the string representation.
In case of the search operators less, not less, greater, and not greater, this is the same as a numerical comparison.
For example, 000010 matches 00001006032000.
Sorting
Sorting is done by comparing the String values.
If both values are identifiers, this works well because both have the same length.