This document describes the XML schema for the Sitemap protocol.
The Sitemap protocol format consists of XML tags. All data values in a Sitemap must
be
entity-escaped. The file itself must be UTF-8 encoded.
The Sitemap must:
- Begin with an opening
<urlset> tag and
end with a closing </urlset> tag.
- Specify the namespace (protocol standard) within the
<urlset>
tag.
- Include a
<url> entry for each URL, as
a parent XML tag.
- Include a
<loc> child entry for each
<url> parent tag.
All other tags are optional. Support for these optional tags may vary among search
engines. Refer to each search engine's documentation for details.
Also, all URLs in a Sitemap must be from a single host, such as www.example.com
or store.example.com. For further details, refer the
Sitemap file
location
Sample XML Sitemap
The following example shows a Sitemap that contains just one URL and uses all optional
tags. The optional tags are in italics.
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://www.example.com/</loc>
<lastmod>2005-01-01</lastmod>
<changefreq>monthly</changefreq>
<priority>0.8</priority>
</url>
</urlset>
Also see our example with
multiple URLs.
XML tag definitions
The available XML tags are described below.
| Attribute
|
|
Description
|
|---|
<urlset>
|
required
|
Encapsulates the file and references the current protocol standard. |
<url>
|
required
|
Parent tag for each URL entry. The remaining tags are children of this tag. |
<loc>
|
required
|
URL of the page. This URL must begin with the protocol (such as http) and end with
a trailing slash, if your web server requires it. This value must be less than 2,048
characters. |
<lastmod>
|
optional
|
The date of last modification of the file. This date should be in
W3C Datetime format. This format allows you to omit the time portion, if
desired, and use YYYY-MM-DD.
Note that this tag is separate from the If-Modified-Since (304) header the server
can return, and search engines may use the information from both sources differently. |
<changefreq>
|
optional
|
How frequently the page is likely to change. This value provides general information
to search engines and may not correlate exactly to how often they crawl the page.
Valid values are:
- always
- hourly
- daily
- weekly
- monthly
- yearly
- never
The value "always" should be used to describe documents that change each time they
are accessed. The value "never" should be used to describe archived URLs.
Please note that the value of this tag is considered a hint and not a command.
Even though search engine crawlers may consider this information when making decisions,
they may crawl pages marked "hourly" less frequently than that, and they may crawl
pages marked "yearly" more frequently than that. Crawlers may periodically crawl
pages marked "never" so that they can handle unexpected changes to those pages. |
<priority>
|
optional
|
The priority of this URL relative to other URLs on your site. Valid values range
from 0.0 to 1.0. This value does not affect how your pages are compared to pages
on other sites—it only lets the search engines know which pages you deem most
important for the crawlers.
The default priority of a page is 0.5.
Please note that the priority you assign to a page is not likely to influence the
position of your URLs in a search engine's result pages. Search engines may use
this information when selecting between URLs on the same site, so you can use this
tag to increase the likelihood that your most important pages are present in a search
index.
Also, please note that assigning a high priority to all of the URLs on your site
is not likely to help you. Since the priority is relative, it is only used to select
between URLs on your site. |
Entity escaping
Your Sitemap file must be UTF-8 encoded (you can generally do this when you save
the file). As with all XML files, any data values (including URLs) must use entity
escape codes for the characters listed in the table below.
| Character
|
Escape Code
|
|---|
| Ampersand
|
&
|
&
|
| Single Quote
|
'
|
'
|
| Double Quote
|
"
|
"
|
| Greater Than
|
>
|
>
|
| Less Than
|
<
|
<
|
In addition, all URLs (including the URL of your Sitemap) must be URL-escaped and
encoded for readability by the web server on which they are located. However, if
you are using any sort of script, tool, or log file to generate your URLs (anything
except typing them in by hand), this is usually already done for you. Please check
to make sure that your URLs follow the
RFC-3986 standard for URIs, the
RFC-3987
standard for IRIs, and the
XML standard.
Below is an example of a URL that uses a non-ASCII character (
ü),
as well as a character that requires entity escaping (
&):
http://www.example.com/ümlat.php&q=name
Below is that same URL, ISO-8859-1 encoded (for hosting on a server that uses that
encoding) and URL escaped:
http://www.example.com/%FCmlat.php&q=name
Below is that same URL, UTF-8 encoded (for hosting on a server that uses that encoding)
and URL escaped:
http://www.example.com/%C3%BCmlat.php&q=name
Below is that same URL, but also entity escaped:
http://www.example.com/%C3%BCmlat.php&q=name
Sample XML Sitemap
The following example shows a Sitemap in XML format. The Sitemap in the example
contains a small number of URLs, each using a different set of optional parameters.
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://www.example.com/</loc>
<lastmod>2005-01-01</lastmod>
<changefreq>monthly</changefreq>
<priority>0.8</priority>
</url>
<url>
<loc>http://www.example.com/catalog?item=12&desc=vacation_hawaii</loc>
<changefreq>weekly</changefreq>
</url>
<url>
<loc>http://www.example.com/catalog?item=73&desc=vacation_new_zealand</loc>
<lastmod>2004-12-23</lastmod>
<changefreq>weekly</changefreq>
</url>
<url>
<loc>http://www.example.com/catalog?item=74&desc=vacation_newfoundland</loc>
<lastmod>2004-12-23T18:00:15+00:00</lastmod>
<priority>0.3</priority>
</url>
<url>
<loc>http://www.example.com/catalog?item=83&desc=vacation_usa</loc>
<lastmod>2004-11-23</lastmod>
</url>
</urlset>
Using Sitemap index files (to group multiple sitemap
files)
You can provide multiple Sitemap files, but each Sitemap file that you provide must
have no more than 50,000 URLs and must be no larger than 10MB (10,485,760 bytes).
If you would like, you may compress your Sitemap files using gzip to reduce your
bandwidth requirement; however the sitemap file once uncompressed must be no larger
than 10MB. If you want to list more than 50,000 URLs, you must create multiple Sitemap
files.
If you do provide multiple Sitemaps, you should then list each Sitemap file in a
Sitemap index file. Sitemap index files may not list more than 50,000 Sitemaps and
must be no larger than 10MB (10,485,760 bytes) and can be compressed. You can have
more than one Sitemap index file. The XML format of a Sitemap index file is very
similar to the XML format of a Sitemap file.
The Sitemap index file must:
- Begin with an opening
<sitemapindex>
tag and end with a closing </sitemapindex> tag.
- Include a
<sitemap> entry
for each Sitemap as a parent XML tag.
- Include a
<loc> child entry for
each <sitemap> parent tag.
The optional
<lastmod> tag
is also available for Sitemap index files.
Note: A Sitemap index file can only specify Sitemaps that are found
on the same site as the Sitemap index file. For example, http://www.yoursite.com/sitemap_index.xml
can include Sitemaps on http://www.yoursite.com but not on http://www.example.com
or http://yourhost.yoursite.com. As with Sitemaps, your Sitemap index file must
be UTF-8 encoded.
Sample XML Sitemap
Index
The following example shows a Sitemap index that lists two Sitemaps:
<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>http://www.example.com/sitemap1.xml.gz</loc>
<lastmod>2004-10-01T18:23:17+00:00</lastmod>
</sitemap>
<sitemap>
<loc>http://www.example.com/sitemap2.xml.gz</loc>
<lastmod>2005-01-01</lastmod>
</sitemap>
</sitemapindex>
Note: Sitemap URLs, like all values in your XML files, must be
entity escaped.
Sitemap
Index XML Tag Definitions
| Attribute
|
|
Description
|
<sitemapindex>
|
required
|
Encapsulates information about all of the Sitemaps in the file.
|
<sitemap>
|
required
|
Encapsulates information about an individual Sitemap.
|
<loc>
|
required
|
Identifies the location of the Sitemap.
This location can be a Sitemap, an Atom file, RSS file or a simple text file. |
<lastmod>
|
optional
|
Identifies the time that the corresponding Sitemap file was modified. It does not
correspond to the time that any of the pages listed in that Sitemap were changed.
The value for the lastmod tag should be in
W3C Datetime format.
By providing the last modification timestamp, you enable search engine crawlers
to retrieve only a subset of the Sitemaps in the index i.e. a crawler may only retrieve
Sitemaps that were modified since a certain date. This incremental Sitemap fetching
mechanism allows for the rapid discovery of new URLs on very large sites. |
Other Sitemap formats
The Sitemap protocol enables you to provide details about your pages to search engines,
and we encourage its use since you can provide additional information about site
pages beyond just the URLs. However, in addition to the XML protocol, we support
RSS feeds and text files, which provide more limited information.
Syndication feed
You can provide an RSS (Real Simple Syndication) 2.0 or Atom 0.3 or 1.0 feed. Generally,
you would use this format only if your site already has a syndication feed. Note
that this method may not let search engines know about all the URLs in your site,
since the feed may only provide information on recent URLs, although search engines
can still use that information to find out about other pages on your site during
their normal crawling processes by following links inside pages in the feed. Make
sure that the feed is located in the highest-level directory you want search engines
to crawl. Search engines extract the information from the feed as follows:
- <link> field - indicates the URL
- modified date field (the <pubDate> field for RSS feeds and the <updated>
date for Atom feeds) - indicates when each URL was last modified. Use of
the modified date field is optional.
Text file
You can provide a simple text file that contains one URL per line. The text file
must follow these guidelines:
- The text file must have one URL per line. The URLs cannot contain embedded new lines.
- You must fully specify URLs, including the http.
- Each text file can contain a maximum of 50,000 URLs and must be no larger than 10MB
(10,485,760 bytes). If you site includes more than 50,000 URLs, you can separate
the list into multiple text files and add each one separately.
- The text file must use UTF-8 encoding. You can specify this when you save the file
(for instance, in Notepad, this is listed in the Encoding menu of the Save As dialog
box).
- The text file should contain no information other than the list of URLs.
- The text file should contain no header or footer information.
- If you would like, you may compress your Sitemap text file using gzip to reduce
your bandwidth requirement.
- You can name the text file anything you wish. Please check to make sure that your
URLs follow the RFC-3986 standard
for URIs, the RFC-3987 standard
for IRIs
- You should upload the text file to the highest-level directory you want search engines
to crawl and make sure that you don't list URLs in the text file that are located
in a higher-level directory.
Sample text file entries are shown below.
http://www.example.com/catalog?item=1
http://www.example.com/catalog?item=11
Sitemap file location
The location of a Sitemap file determines the set of URLs that can be included in
that Sitemap. A Sitemap file located at http://example.com/catalog/sitemap.xml can
include any URLs starting with http://example.com/catalog/ but can not include URLs
starting with http://example.com/images/.
If you have the permission to change http://example.org/path/sitemap.xml, it is
assumed that you also have permission to provide information for URLs with the prefix
http://example.org/path/. Examples of URLs considered valid in http://example.com/catalog/sitemap.xml
include:
http://example.com/catalog/show?item=23
http://example.com/catalog/show?item=233&user=3453
URLs not considered valid in http://example.com/catalog/sitemap.xml include:
http://example.com/image/show?item=23
http://example.com/image/show?item=233&user=3453
https://example.com/catalog/page1.php
Note that this means that all URLs listed in the Sitemap must use the same protocol
(http, in this example) and reside on the same host as the Sitemap. For instance,
if the Sitemap is located at http://www.example.com/sitemap.xml, it can't include
URLs from http://subdomain.example.com.
URLs that are not considered valid are dropped from further consideration. It is
strongly recommended that you place your Sitemap at the root directory of your web
server. For example, if your web server is at example.com, then your Sitemap index
file would be at http://example.com/sitemap.xml. In certain cases, you may need
to produce different Sitemaps for different paths (e.g., if security permissions
in your organization compartmentalize write access to different directories).
If you submit a Sitemap using a path with a port number, you must include that port
number as part of the path in each URL listed in the Sitemap file. For instance,
if your Sitemap is located at http://www.example.com:100/sitemap.xml, then each
URL listed in the Sitemap must begin with http://www.example.com:100.
Sitemaps & Cross
Submits
To submit Sitemaps for multiple hosts from a single host, you need to "prove" ownership
of the host(s) for which URLs are being submitted in a Sitemap. Here's an example.
Let's say that you want to submit Sitemaps for 3 hosts:
www.host1.com with Sitemap file sitemap-host1.xml
www.host2.com with Sitemap file sitemap-host2.xml
www.host3.com with Sitemap file sitemap-host3.xml
Moreover, you want to place all three Sitemaps on a single host: www.sitemaphost.com.
So the Sitemap URLs will be:
http://www.sitemaphost.com/sitemap-host1.xml
http://www.sitemaphost.com/sitemap-host2.xml
http://www.sitemaphost.com/sitemap-host3.xml
By default, this will result in a "cross submission" error since you are trying
to submit URLs for www.host1.com through a Sitemap that is hosted on www.sitemaphost.com
(and same for the other two hosts). One way to avoid the error is to prove that
you own (i.e. have the authority to modify files) www.host1.com. You can do this
by modifying the robots.txt file on www.host1.com to point to the Sitemap on www.sitemaphost.com.
In this example, the robots.txt file at http://www.host1.com/robots.txt would contain
the line "Sitemap: http://www.sitemaphost.com/sitemap-host1.xml". By modifying the
robots.txt file on www.host1.com and having it point to the Sitemap on www.sitemaphost.com,
you have implicitly proven that you own www.host1.com. In other words, whoever controls
the robots.txt file on www.host1.com trusts the Sitemap at http://www.sitemaphost.com/sitemap-host1.xml
to contain URLs for www.host1.com. The same process can be repeated for the other
two hosts.
Now you can submit the Sitemaps on www.sitemaphost.com.
When a particular host's robots.txt, say http://www.host1.com/robots.txt, points
to a Sitemap or a Sitemap index on another host; it is expected that for each of
the target Sitemaps, such as http://www.sitemaphost.com/sitemap-host1.xml, all the
URLs belong to the host pointing to it. This is because, as noted earlier, a Sitemap
is expected to have URLs from a single host only.
Validating your Sitemap
The following XML schemas define the elements and attributes that can appear in
your Sitemap file. You can download this schema from the links below:
For Sitemaps:
http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd
For Sitemap index files:
http://www.sitemaps.org/schemas/sitemap/0.9/siteindex.xsd
There are a number of tools available to help you validate the structure of your
Sitemap based on this schema. You can find a list of XML-related tools at each of
the following locations:
http://www.w3.org/XML/Schema#Tools
http://www.xml.com/pub/a/2000/12/13/schematools.html
In order to validate your Sitemap or Sitemap index file against a schema, the XML
file will need additional headers as shown below.
Sitemap:
<?xml version='1.0' encoding='UTF-8'?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
...
</url>
</urlset>
Sitemap index file:
<?xml version='1.0' encoding='UTF-8'?>
<sitemapindex xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/siteindex.xsd"
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
...
</sitemap>
</sitemapindex>
Extending the Sitemaps protocol
You can extend the Sitemaps protocol using your own namespace. Simply specify this
namespace in the root element. For example:
<?xml version='1.0' encoding='UTF-8'?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:example="http://www.example.com/schemas/example_schema"> <!-- namespace extension -->
<url>
<example:example_tag>
...
</example:example_tag>
...
</url>
</urlset>
Informing search engine crawlers
Once you have created the Sitemap file and placed it on your webserver, you need
to inform the search engines that support this protocol of its location. You can
do this by:
The search engines can then retrieve your Sitemap and make the URLs available to
their crawlers.
Submitting your Sitemap via the search
engine's submission interface
To submit your Sitemap directly to a search engine, which will enable you to receive
status information and any processing errors, refer to each search engine's documentation.
Specifying the Sitemap location in
your robots.txt file
You can specify the location of the Sitemap using a robots.txt file. To do this,
simply add the following line including the full URL to the sitemap:
Sitemap: http://www.example.com/sitemap.xml
This directive is independent of the user-agent line, so it doesn't matter where
you place it in your file. If you have a Sitemap index file, you can include the
location of just that file. You don't need to list each individual Sitemap listed
in the index file.
You can specify more than one Sitemap file per robots.txt file.
Sitemap: http://www.example.com/sitemap-host1.xml
Sitemap: http://www.example.com/sitemap-host2.xml
Submitting your Sitemap via an HTTP request
To submit your Sitemap using an HTTP request (replace <searchengine_URL> with
the URL provided by the search engine), issue your request to the following URL:
<searchengine_URL>/ping?sitemap=sitemap_url
For example, if your Sitemap is located at http://www.example.com/sitemap.gz, your
URL will become:
<searchengine_URL>/ping?sitemap=http://www.example.com/sitemap.gz
URL encode everything after the /ping?sitemap=:
<searchengine_URL>/ping?sitemap=http%3A%2F%2Fwww.yoursite.com%2Fsitemap.gz
You can issue the HTTP request using wget, curl, or another mechanism of your choosing.
A successful request will return an HTTP 200 response code; if you receive a different
response, you should resubmit your request. The HTTP 200 response code only indicates
that the search engine has received your Sitemap, not that the Sitemap itself or
the URLs contained in it were valid. An easy way to do this is to set up an automated
job to generate and submit Sitemaps on a regular basis.
Note: If you are providing a Sitemap index file, you only need
to issue one HTTP request that includes the location of the Sitemap index file;
you do not need to issue individual requests for each Sitemap listed in the index.
Excluding content
The Sitemaps protocol enables you to let search engines know what content you would
like indexed. To tell search engines the content you don't want indexed, use a robots.txt
file or robots meta tag. See
robotstxt.org
for more information on how to exclude content from search engines.
Last Updated: 27 February 2008
sitemaps.org - Protocol
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