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The term vocabulary and postings lists in Software Paint 3 of 9 barcode in Software The term vocabulary and postings lists




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The term vocabulary and postings lists use software bar code 39 writer toaccess 3 of 9 with software Barcodes for Mobile Applications 132 1962 . START Algeria achieved its independence in 1962 after 132 years of French occupation. Figure 2.2 The conc eptual linear order of characters is not necessarily the order that you see on the page. In languages that are written right to left, such as Hebrew and Arabic, it is quite common to also have left-to-right text interspersed, such as numbers and dollar amounts.

With modern Unicode representation concepts, the order of characters in les matches the conceptual order, and the reversal of displayed characters is handled by the rendering system, but this may not be true for documents in older encodings.. essentially linear barcode 39 for None structure remains. This is what is represented in the digital representation of Arabic, as shown in Figure 2.1.

. 2.1.2 Choosing a document unit document The next p 3 of 9 for None hase is to determine what the document unit for indexing is. Thus unit far, we have assumed that documents are xed units for the purposes of in-. dexing. For example , we take each le in a folder as a document. But there are many cases in which you might want to do something different.

A traditional Unix (mbox-format) email le stores a sequence of email messages (an email folder) in one le, but you might wish to regard each email message as a separate document. Many email messages now contain attached documents, and you might then want to regard the email message and each contained attachment as separate documents. If an email message has an attached zip le, you might want to decode the zip le and regard each le it contains as a separate document.

Going in the opposite direction, various pieces of web software (such as latex2html) take things that you might regard A as a single document (e.g., a Powerpoint le or a L TEX document) and split them into separate HTML pages for each slide or subsection, stored as separate les.

In these cases, you might want to combine multiple les into a single document. indexing More generally, for very long documents, the issue of indexing granularity granularity arises. For a collection of books, it would usually be a bad idea to index an entire book as a document.

A search for Chinese toys might bring up a book that mentions China in the rst chapter and toys in the last chapter, but this does not make it relevant to the query. Instead, we may well wish to index each chapter or paragraph as a mini-document. Matches are then more likely to be relevant, and because the documents are smaller it will be much easier for the user to nd the relevant passages in the document.

But why stop there We could treat individual sentences as mini-documents. It becomes clear that there is a precision/recall tradeoff here. If the units get too small, we are likely to miss important passages because terms were distributed over several mini-documents, whereas if units are too large we tend to get spurious matches and the relevant information is hard for the user to nd.

. P1: KRU/IRP irbook Software barcode code39 CUUS232/Manning 978 0 521 86571 5 May 27, 2008 12:8. 2.2 Determining the vocabulary of terms The problems with l barcode 3/9 for None arge document units can be alleviated by use of explicit or implicit proximity search (Sections 2.4.2 and 7.

2.2), and the tradeoffs in resulting system performance that we are hinting at are discussed in 8. The issue of index granularity, and in particular a need to simultaneously index documents at multiple levels of granularity, appears prominently in XML retrieval, and is taken up again in 10.

An information retrieval (IR) system should be designed to offer choices of granularity. For this choice to be made well, the person who is deploying the system must have a good understanding of the document collection, the users, and their likely information needs and usage patterns. For now, we assume that a suitable size document unit has been chosen, together with an appropriate way of dividing or aggregating les, if needed.

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