A Uniform Resource Identifier (URI) scheme is the top level of the uniform resource identifier (URI) naming structure. URLs are a type of URI.
An app: URL is a url that can be used by a packaged application to address resources within its container (e.g., a .zip file).
Examples
foo://username:password@example.com:8042/over/there/index.dtb?type=animal&name=narwhal#nose
\_/ \_______________/ \_________/ \__/ \___/ \_/ \______________________/ \__/
| | | | | | | |
| userinfo hostname port | | query fragment
| \________________________________/\_____________|____|/ \__/ \__/
scheme | | | | | |
name authority | | | | |
| path | | interpretable as keys
\_______________________________________/ | |
| | | |
| host | |
| \_______________________________________________|____|/ \____/ \_____/
| | | | | |
scheme hierarchical part | | interpretable as values
name | |
| path interpretable as filename |
| ___________|____________ |
/ \ / \ |
urn:example:animal:ferret:nose interpretable as extension
path
_________|________
scheme / \
name userinfo hostname query
_|__ ___|__ ____|____ _____|_____
/ \ / \ / \ / \
mailto:username@example.com?subject=Topic
