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- <a name="File-Format"></a>
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- <a name="File-Format-1"></a>
- <h2 class="section">2.3 File Format</h2>
- <a name="index-file-format"></a>
- <p>A virtual code file consists of an optional text preamble, followed by
- the concrete representation for a tree. The latter uses the
- syntax described in the previous section. The purpose of this section is
- to specify the remaining details of the file format.
- </p>
- <p>The format for virtual code files may also be used for other purposes
- by virtual code applications, as it is automatically detected and parsed
- by <code>avram</code> when used in an input file, and can be automatically
- written to output files at the discretion of the application.
- </p>
- <p>Other than virtual code files, input files not conforming to this format
- are not an error as far as <code>avram</code> is concerned, because they are
- <a name="index-text-files"></a>
- assumed to be text files. Applications can detect in virtual code
- the assumption that is made and report an error if appropriate.
- </p>
- <p>Although the data file format includes no checksums or other explicit
- <a name="index-checksums"></a>
- methods of error detection, the concrete syntax itself provides a
- good measure of protection against undetected errors. The probability is
- vanishingly small that a random alteration to any valid encoding leaves
- it intact, because every bit in the sequence either mandates or
- prohibits the occurrence of two more bits somewhere after it. Errors in
- different parts of the file would have to be consistent with one another
- to go unnoticed.
- </p>
- <table class="menu" border="0" cellspacing="0">
- <tr><td align="left" valign="top"><a href="Preamble-Section.html#Preamble-Section">2.3.1 Preamble Section</a></td><td> </td><td align="left" valign="top">
- </td></tr>
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