
68 Text Mining and Visualization: Case Studies Using Open-Source Tools
FIGURE 3.3: A column of a data table containing term cells. The terms have been assigned
POS tags (tag values and tag types).
Due to the open nature of KNIME, additional tagger nodes as well as custom tag sets
can also be integrated.
3.2.2.1 Unmodifiabililty
Recognized and tagged named entities can be set as unmodifiable in order to prevent
them from being separated, manipulated, or filtered by subsequent nodes of the prepro-
cessing category. Usually recognized named entities should not be filtered or manipulated
by subsequent nodes in the workflow. It does not make much sense to stem ...