5
Single-class
vs. Multi-classes lines
lSingle-class line
¡Each line with a single element
¡e.g. <title> Automatic Document Metadata Extraction using Support Vector Machine
</title>
lMulti-classes line
¡Each line with several elements
¡e.g. <author> Hui Han, C. Lee Giles, Ere Manavoglu</author>