Reference Manual for Atbe a Tool for Approximate Tree Pattern Matching Alpha
Reference Manual for Atbe a Tool for Approximate Tree Pattern Matching Alpha
J T L Wang
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A most commonly used re- trieval operation in applications is perhaps to find trees closest to a given pattern. '' This type of retrieval might be expressed in ATBE queries as follows: N 1 1 M / \ B H A / \ H H retrieve tree t from file F where dist(pa, t) = min (dist(pa, u) where u is tree of file F) Figure 2. 3: ATBE query for finding trees in file F that are closest to the pattern. Trees obtained from the query are displayed one at a time on the screen.^ The user is able to see the best mapp...ing that yields the distance. When a solution tree is large (e. G. , contains hundreds of nodes), its edges and nodes are shrunk proportionally, so that the entire tree can fit in the screen; users may then lasso part of interest and zoom in to see more detail (see Section 3. 5). Figure 2. 4: Horizontal normal form for the tree in Figure 2. 3. In situations in which trees represent noisy information, users might wish to find data trees that are within certain distance of the pattern (this type of retrieval is known as the good-match retrieval [25]).
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