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=====Notes on RFC metadata in the v3 era=====

  * New XSD is in place (10 Sept 2019): https://www.rfc-editor.org/in-notes/rfc-index.xsd
  * rfc-index.txt, .html, .xml (and similar files) are slightly different from before, this is due to:
    *  added new publication formats and source format.
    * removed file sizes. (Byte count is no longer included as metadata for each RFC.)
  * There is only one page count per RFC, even if it is available in multiple file formats. 
    * As a result, in rfc-index.xml, page-count has been "pulled up" a level.
  * For page count, source of data will change.
    * For pre-v3 docs, it is the page count of the .txt file (except for a handful of old RFCs where there is no .txt file).
    * For v3 docs, it will be the page count of the PDF file.

=== PDF naming conventions ===
  * Externally, PDFs are listed simply as "PDF" (whether v3 or otherwise).
  * Internally, the db holds "v3PDF" to mean v3 output; "PDF" is used for pre-v3.
  * As before, .txt.pdf files are not listed in index files.

=== TEXT naming conventions ===
  * Externally, .txt format (whether pre-v3 or not) is listed as "TEXT".\\ Exception: rfc-index.xml: will display "ASCII" (for pre-v3) and "TEXT" (afterwards). Rationale: other index files were already using the "TEXT" instead of "ASCII", so they weren't changed to start differentiating.
  * Internally, the db holds "TEXT" to mean v3 output; "ASCII" is used for pre-v3.

=== New resource: JSON files of RFC metadata ===
  * One JSON file per RFC was made available 11 September 2019.
  * Each file contains data similar to an entry in rfc-index.xml.
  * Sample file: https://www.rfc-editor.org/rfc/rfc5234.json

=== Examples ===

Example: RFC4254
<code>
-- OLD
    <format>
    <file-format>ASCII</file-format>
        <char-count>50338</char-count>
        <page-count>24</page-count>
    </format>
    <format>
    <file-format>HTML</file-format>
    </format>

-- NEW

    <format>
        <file-format>ASCII</file-format>
        <file-format>HTML</file-format>
    </format>
    <page-count>24</page-count>
</code>
For comparison, the JSON record includes (among other data):
<code>
"format":["ASCII","HTML"],"page_count":"24"
</code>
---------------

Example: RFC8888 (v3 era)
<code>
-- NEW

    <format>
        <file-format>TEXT</file-format>
        <file-format>HTML</file-format>
        <file-format>PDF</file-format>
        <file-format>XML</file-format>
    </format>
    <page-count>48</page-count>
</code>

For comparison, the JSON record would include (among other data):
<code>
"format":["TEXT","HTML","PDF","XML"],"page_count":"48"
</code>
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