Title	Vertex Guards in a Subclass of Orthogonal Polygons
Author	Ana Mafalda Martins, Ant?nio Leslie Bajuelos
Citation	Vol. 6  No. 9  pp. 102-108
Keywords	Computational Geometry, Art Gallery Problem and Theorem, Orthogonal polygons, Spiral polygons

Title	ITRM: A Temporal Data Model Supporting Indeterminacy
Author	Jia-Dong Ren, Hui-Li Peng, Xiao-Jian Zhang
Citation	Vol. 6  No. 9  pp. 97-101
Keywords	Indeterminacy, ITRM, Time interval, Temporal relational algebra operator

Title	Map-based Public Awareness Building System for Disaster Prevention
Author	Akira Hattori, Sayaka Matsumoto, Takami Yasuda, Shigeki Yokoi
Citation	Vol. 6  No. 9  pp. 90-96
Keywords	Disaster Prevention, Public awareness building, Map-based system, Cards and maps association, Web

Title	A Clustering-based Scheme for Labeling XML Trees
Author	Sadegh Soltan, Masoud Rahgozar
Citation	Vol. 6  No. 9  pp. 84-89
Keywords	XML, Tree Labeling, Query Optimization