| The Order of Processing
                          In order to fully control the WebMake file processing using Perl code, it's
                          important to know the order in which the tags and so on are parsed.
                          
                         Parsing of the WebMake File
                          Initially, WebMake used a set order of tag parsing, but this proved to be
                          unwieldy and confusing. Now, it uses the order in which the tags are defined
                          in the .wmk file, so if you want tag A to be interpreted before tag B, put A
                          before B and the right thing will happen.
                          
                         
                          Perl code embedded inside the WebMake file, using <{perl}> processing directives, will be evaluated there
                          and then (unless the <{perl}> block is embedded in another block, such
                          as a content item or <out> file block).
                          
                         
                          This means that you can define content items by hand, search for other content
                          items using a <contents> tag, and then use a <{perl}> section to define a list of all content items
                          which satisfy a particular set of criteria.
                          
                         
                          This list can then be used in later <{perl}> blocks, content references, or <for> tags.
                          
                         Processing the <out> Tags
                          Once the file is fully parsed, the <out> tags are
                          processed, one by one.
                          
                         
                          At this point, content references, <{set}> tags, and
                          <{perl}> processing directives will be interpreted,
                          if they are found within content chunks. Finally, deferred content references
                          and metadata references are expanded.
                          
                         
                          Eventually, no content references, <{set}> tags, <{perl}> processing directives, metadata references, or
                          URL references are left in the file text. At this point, the file is written
                          to disk under a temporary name, and the next output file is processed.
                          
                         
                          Once all output files are processed, the entire set of files which have
                          been modified are moved into place, replacing any previous versions.
                          
                         
                          
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