dlf Namespace of Digital Library Federation Identifiers 2008-05-13 Digital Library Federation 1755 Massachusetts Avenue NW Suite 500, Washington DC 20036-2124 http://www.diglib.org/ Barrie Howard bhoward@clir.org +1 202 939 4769 http://www.diglib.org/ Identifiers in the dlf namespace are used to identify information assets used in Digital Library Federation research and development projects. An 'info' URI with namespace 'dlf' takes the form: info:dlf/<dlf-project>/<project-specific-id> dlf-project = ALPHA *( ALPHA | DIGIT ) i.e. alphanumeric with leading alphabetic character. Values of dlf-project are assigned by the Digital Library Federation and registered at http://diglib.org/namespace/Projects.txt. At the time of this registration the only valid dlf-project value is "Aquifer". project-specific-id = project-specific-component *("/" project-specific-component) project-specific-component = *pchar pchar is as defined in RFC 3986, that is: pchar = unreserved | pct-encoded | sub-delims | ":" | "@" unreserved = ALPHA | DIGIT | "-" | "." | "_" | "~" pct-encoded = "%" HEXDIG HEXDIG sub-delims = "!" | "$" | "&" | "'" | "(" | ")" | "*" | "+" | "," | ";" | "=" ALPHA, DIGIT, AND HEXDIG are as defined in RFC 2234: upper or lower case alphabetic (A-Z | a-z), decimal digit (0-9), and hexadecimal digit (DIGIT | "A" | "B" | "C" | "D" | "E" | "F") respectively. Percent Encoded Characters No characters in general need to be percent encoded. http://www.diglib.org/namespace/IdentifierSyntax.txt All identifiers in the dlf namespace are case-sensitive. http://www.diglib.org/namespace/IdentifierNormalization.txt info:dlf/Aquifer/AssetActions/AssetDefinition/ info:dlf/Aquifer/AssetActions/MODS3.2-extension/ info:dlf/Aquifer/AssetActions/getWebView Identifiers in the dlf namespace are used to identify information assets used in Digital Library Federation research and development projects. Identifiers will vary according to project. Their uses currently include: * Target namespaces for XML Schema, for example: info:dlf/Aquifer/AssetActions/AssetDefinition/ * Identifiers for use in ontologies, for example RDF property labels, such as: info:dlf/Aquifer/AssetActions/getWebView http://www.diglib.org/namespace/NamespaceInformation.txt No service mechanisms are at present defined.