Oracle8i Application Developer's Guide - XML Release 3 (8.1.7) Part Number A86030-01 |
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Using interMedia Text to Search and Retrieve Data from XML Documents, 7 of 22

## Assumptions Made in this Chapter's Examples

XML text is aVARCHAR2 or CLOB type in an Oracle8i database table with character semantics.

interMedia Text can also deal with documents on a file system or on URLs. We do not consider these document types here.

To simplify the examples included in this chapter we consider a subset of the interMedia Text options.

We have made the following assumptions here:

- All XML data here is represented using US-ASCII, a 7 bit character set.

- Issues about whether a character such as "*" is treated as white space or as part of a word are not included.

- Storage characteristics of the Oracle schema object that implement the TEXT index are not considered.

- We focus here on the SECTION GROUP parameter in the CREATE INDEX or ALTER INDEX statement1. Here is an example of using SECTION GROUP in CREATE INDEX:

      CREATE INDEX my_index
        ON my_table ( my_column )
        INDEXTYPE IS ctxsys.context
        PARAMETERS ( 'SECTION GROUP my_section_group' ) ;

- Specifically, we focus on using AUTO_SECTION_GROUP and XML_SECTION_GROUP.

- Tagged or marked up data. We focus here on how to handle XML data. interMedia Text handles many other kinds of data.

1 Other parameter types are available for CREATE INDEX and ALTER INDEX. These are DATASTORE, FILTER, LEXER, STOPLIST, and WORDLIST.

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