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Databases - Practical PostgreSQL
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Naming Conventions

The valid characters with which you may define an LXP variable's name are:

  • Any letter ( a–z , A–Z )

  • Any digit ( 0–9 )

  • The underscore (  _  )

The valid characters with which you define a complete LXP object's name are:

  • Any letter ( a–z , A–Z )

  • Any digit ( 0–9 )

  • The underscore (  _  )

  • The period ( . )

  • Square brackets ( [ ]  )

Note that while numbers are the most common form of subscript (since they are used implicitly by CGI arrays; see the Section called CGI Arrays "), any legal characters may be used within square brackets following an object's name (e.g., pseudo_array[example]).

When parsing the attributes of an LXP tag, some special character symbols may be used to substitute the value of a variable directly into either the attribute's name or value (see the Section called Tag Parsing " for more about this technique). These characters are: the dollar sign ($) for variables, and the at sign (@) for objects.

It must be understood that while special character symbols are sometimes used to substitute variable values into a tag's attributes, these character symbols are not part of a variable's name and should not be used in contexts where a literal variable or object name is expected.

Databases - Practical PostgreSQL
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