Make sitemap with A-Parser

Sitemap (Wiki) - this is XML-file with the information for the search engines (such as Yandex, Google, Bing) about web pages, which are to be indexing. It helps search engines index the site more intelligently. Some SEO-experts consider the lack of such map a gross error. On the Internet there are many services and tools for creating these maps, as well as for their validation. We try to create sitemap using A-parser.

So, let's see what exactly we need to do.

1. Check all internal links on the site.
2. Find out all the necessary parameters for each link.
3. Save all this information to a file sitemap.xml.

Sitemap protocol is described on the website sitemaps.org. For solving this problemus perfectly will approach the parser HTML::LinkExtractor. He is able to collect from the site links to the specified depth and return the server response headers (which typically contains the date of last change). For the result output will respond template engine Template Toolkit, which will generate the right kind of output file.

Spoiler: Code

Code:
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Notes:

• Not every server and not for each page returned a header last-modified;
• based on availability last-modified header for the current link will be (or not, if the header is not returned) describes the parameters <lastmod> and <changefreq>;
• <changefreq> is calculated based on the period of time that has elapsed since the last modification of the page;
  
• <priority> is calculated depending on the depth of the page;
• depth of collecting of links regulated by parameter Parse to level;
• not recommended to set a large depth, because limit in one sitemap.xml is 50000 URL.

In an end result sitemap looks like this:

 

To use multiple sitemap files, you must also generate an index file sitemap_index.xml. In this case, this impossible to make. But separated into multiple sitemap files every 50,000 URL - possible. To do this, in the File name field enter the following:

Code:

[% l = l + 1; USE Math; "sitemap"_ Math.int(l div 50000 + 1) _".xml" %]

But for this construction has worked in this preset - must wait for the implementation of this improvement.