Used to signal "no space present" between two tokens (usually between a <f> elements and a <d> element, or between two <d> elements. However, in the manually annotated data, it can also appear between two <f> elements. In any case, it signals that between the immediately preceding element and the immediately following element there was no space in the original source text as received from the text supplier. (This might be important, for example, for more reliable abbreviation or hyphenated compound identification.) Conversely, if two input tokens (i.e., two <d>/<f> elements) have been separated by one or more white-space character in he original textual material, there is no explicit markup in the data (since for most languages, this is the default).
For most applications, all the <D> tags can safely be ignored. (However, the standard morphological processing - such as in the PDT - does take this tag into account.)
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