FEED Validator

Documentation

Tutorials

• How do I declare namespaces in my RSS feed?
• How do I install and run the Feed Validator?

Specifications

• Atom 1.0
• RSS 1.0 specification
• RSS 2.0 specification

Validator messages

Errors

• foo should not have text (all data is in attributes)
• Feeds must specify XML Version 1.0
• Feeds must not contain SYSTEM entities
• Duplicate alternate links with the same type and hreflang
• foo contains more than one bar
• foo values must not be duplicated within a feed
• skipDays can not contain more than 7 day elements
• HTTP Error
• HTTP Protocol Error
• IO Error
• foo must be an email address
• foo attribute of bar must be 'true' or 'false'
• foo must be comma-separated integers
• foo must include an email address
• foo is not a valid mode
• Invalid value for g:country: "foo"
• Invalid value for g:currency: "foo"
• foo must be Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday
• Invalid duration: "foo"
• <expansionState> is a comma-separated list of line numbers.
• Invalid value for foo: "bar"
• Invalid value for foo: "bar"
• Invalid form component name
• foo must be a full URI
• Invalid value for g:location: "foo"
• Invalid value for g:gender: "foo"
• foo must be between 1 and 400
• foo must be between an integer 0 and 24
• guid must be a full URL, unless isPermaLink attribute is false
• foo must be a valid IRI
• foo must be an ISO-8601 date
• foo must be an ISO-8601 date-time
• Invalid value for foo: "bar"
• foo must be an integer
• foo attribute of bar must be a positive integer
• foo is not one of the predefined iTunes categories or sub-categories
• Invalid value for g:label: "foo"
• foo must be an ISO-639 language code
• foo must be between -90 and 90
• foo must be a valid URI
• Invalid value for foo: "bar"
• foo must be between -180 and 180
• foo attribute of bar must be a valid MIME type
• foo is not a valid MIME type
• Invalid value for g:marital_status: "foo"
• foo is in an invalid namespace
• The "version" attribute for the opml element must be 1.0 or 1.1.
• Invalid value for g:payment_accepted: "foo"
• foo must be a percentage
• guid must be a full URL, unless isPermaLink attribute is false
• foo must be a positive integer
• Invalid value for g:price_type: "foo"
• RDF Parsing Error
• foo must be an RFC-822 date-time
• foo must be an RFC 3339 date-time
• Invalid value for g:rating: "foo"
• Invalid value for g:reviewer_type: "foo"
• Invalid value for g:salary_type: "foo"
• Invalid value for g:service: "foo"
• foo is not a valid TAG
• type attribute must be "text", "html", or "xhtml"
• foo attribute of bar must be 'true' or 'false'
• foo is not a valid URI
• foo attribute of bar must be a valid URI
• foo attribute of bar must be a full URL
• foo is not a valid URN
• foo must be hourly, daily, weekly, monthly, or yearly
• Invalid value for foo: "bar"
• foo must be an W3CDTF date
• foo must be between 1 and 144
• Invalid value for g:year: "foo"
• foo attribute of bar must be 'yes', 'no', or 'clean'
• item must contain either title or description
• foo must appear before all entries
• Missing foo attribute: bar
• Missing content or alternate link
• Missing foo element: description
• Missing foo element: bar
• foo must have an href attribute
• Missing foo element: link
• Missing namespace for foo
• Missing foo element: title
• Missing xhtml:div
• There is no blink element in RSS
• foo claims to be base64-encoded, but isn't
• skipHours can not contain more than 24 hour elements
• foo claims to be escaped, but isn't
• Missing namespace for foo
• Feed uses an obsolete namespace
• XML Parsing error: syntax error
• length of nnn exceeds the maximum allowable for foo of mmm
• foo contains more than ten bar elements
• Undefined foo element: bar
• Undefined named entity: foo
• Unexpected foo attribute on bar element
• Unexpected text
• Whitespace not permitted here
• UnicodeError: decoding error, invalid data
• Unknown XML character encoding: foo
• Unable to validate, due to hardcoded resource limits (limit)

Warnings

• foo attribute of bar should not be blank
• The XML encoding does not appear to match the characters used.
• name should not contain email address
• foo should not contain HTML
• foo should not relative URL references
• foo should not contain script tag
• foo should not contain HTML unless declared in the type attribute
• Deprecated RFC 822 date format
• Two entries with the same id
• An item must not include both foo and bar
• A channel must not include both foo and bar
• Two entries with the same value for atom:updated
• Your feed appears to be encoded as “foo”, but your server is reporting “bar”
• type foo/bar used for a document fragment
• Image link doesn't match channel link
• Image not in required format
• Implausible date: foo
• Use commas to separate keywords
• The type attribute on an <outline> element should be a known type.
• An <outline> element whose type is "rss" may have a version attribute, whose value must be RSS, RSS1, RSS2, or scriptingNews.
• No character encoding was specified
• item should contain a guid element
• Missing recommended iTunes foo element: bar
• The recommended <itunes:email> element is missing
• An <outline> element with more than just a "text" attribute should have a "type" attribute indicating how the other attributes are to be interpreted.
• Missing atom:link with rel="self"
• Missing source element: foo
• Missing Textual Content
• Missing outline attribute: title
• Missing content attribute: type
• Missing outline attribute: url
• An <outline> element whose type is "rss" must have an "xmlUrl" attribute.
• Identifier “foo” is not in canonical form (should be “bar”)
• foo should not be blank
• Invalid HTML: explanation
• foo claims to be inline, but may contain HTML.
• The specified guid is not sufficiently unique.
• iTunes elements should only be present in feeds encoded as UTF-8
• Obscure XML character encoding: foo
• Feed is an obsolete version
• The prefix foo generally uses the namespace http://some/other/namespace
• Same-document reference
• foo should not contain script tag
• Self reference doesn't match document location
• "self" link references a non-Atom representation.
• Undecipherable Specification Error
• Missing namespace for foo
• Feeds should not be served with the 'foo' media type
• foo is not a registered link relationship
• Format foo is not supported by iTunes

Information

• This encoding is not mandated by the XML specification: foo
• Date should be a UTC date