The blue lines and the blue text of the captions (used either as part of the URI or literals) designate the criteria for linking the information. The specified mapping rules are applied only to the specified subsets of the information
Semantic Annotation is used for assigning links between the entities, recognized by arbitrary information extraction algorithm, and their semantic descriptions. This sort of metadata provides class and/or instance information about the entities. Moreover, knowledge acquisition can be performed based on the extraction of more complex dependencies:
SP-A is necessary for lungs to respond to hyperventilation or secretagogues with increased DPPC uptake and also modulates the PLA(2)-mediated degradation of internalized DPPC.
The information extraction process recognizes the chunk DPPC (shown in bold above) as the concept 1,2-Dipalmitoylphosphatidylcholine, described in UMLS under the URI http://linkedlifedata.com/resource/umls/id/C0000039.