httpsdoiorg10xxxxyyy

httpsdoiorg10xxxxyyy appears to be a malformed string that superficially resembles a DOI-based URL but does not conform to established DOI syntax. It lacks the required URL scheme (https://) and the standard DOI structure that follows doi.org, making it non-resolvable in typical DOI resolvers. In standard practice, DOIs are accessed via URLs of the form https://doi.org/10.xxxx/yyy, where the prefix 10.xxxx identifies the registrant and the suffix provides an item-specific code.

The canonical format is 10.xxxx/yyy, where the DOI consists of a prefix (the registrant code) and a suffix (the item-specific code). The full, usable URL is formed by prefixing the DOI with https://doi.org/, yielding something like https://doi.org/10.xxxx/yyy. A string such as httpsdoiorg10xxxxyyy fails because it omits the dot after the 10 and the slash separator, and it merges components that should be distinct.

Common causes include missing scheme, missing punctuation, or accidental concatenation when copying or transcribing a citation. To verify a DOI, search in Crossref, PubMed, or the publisher’s site, or attempt resolution through a DOI resolver. If you need a demonstrative example, use a clearly non-existent DOI such as 10.1000/xyz123 and its URL https://doi.org/10.1000/xyz123.