Finding the main themes in a spanish document

Graduated Errors in Approximate Queries Using Hierarchies and Ordered Sets

“…The thesis [8] describes how to map concepts from one ontology to another. A practical use of hierarchies is Clasitex [3], which finds the themes of an article written in Spanish or English. It uses the concept tree, and a word (not in the tree) suggests the topic of one or more concepts in the tree.…”

Reacting to Unexpected Events and Communicating in Spite of Mixed Ontologies

“…It is thus impossible to write a program to handle even each type of event (there is an infinite number of them). To overcome this difficulty, we organize the (infinite) collection of "unanticipated" strings into a tree of unforeseen events (Figure 1), following the lines of CYC [6] and Clasitex [9].…”

“…CYC shows that it is possible to form taxonomies of specialized knowledge areas (which is what we intend to do here, see Table 1), in addition to classifying the common knowledge (goal that, due to its extension -between one and ten million concepts-was not achieved by that project). Trees of specialized knowledge, where the tree takes the form of a data dictionary, were used by the first author [7][8][9]. Similar scenarios.…”

“…Written in db manager Progress. [9] relates words to concepts; it finds the main topics in an article written in Spanish. It does not work on key words, but on concepts.…”

“…It uses a concept tree. For this reason, it can find an article talking about shoes, even if the article does not contain such word, but it contains instead boot, moccasin, sandals..., even if these words may refer to other contexts or concepts: moccasin is also a tribe of American Indians... [3,4] extend [9] by using weights for selecting concepts.…”