Full text search Shelves: using the attributes shelf for normalization

Introduction

This code fragment illustrates the utility of the attributes shelf. When used, it will output "normalized" start tags and end tags around the content of the current element, with all specified attribute values included.

This example can be used as a simple but complete OmniMark program that "normalizes" an SGML document. In practice, such a program will also need to:

• print the default attribute values if desired
• deal with some or all of the processing instructions, internal and external data entities, external text entities, SGML comments, marked sections, and white space
• protect data characters when they might be interpreted as markup
• add line breaks where it is safe to do so

  element #implied
     output "<%q"
     repeat over specified attributes as this-attribute
        output " "
            || key of attribute this-attribute
            || "=%"%v(this-attribute)%""
     again
     output ">" _
            "%c"
     output "</%q>" when content isnt (empty | conref)

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