----URI----Uniforme Resource IdentifierSecventa alfanumerica univoca si universala utilizata pt identificarea unei resurse pe Internet(document, sit web).URI = URL + URNURN - defineste identitatea itemuluiURL - furnizeaza o metoda pt a gasi itemulUn URL este un URI care, pe langa faptul ca identifica o resursa pe Internet, specifica mijloacele de a actiona asupra ei sau obtine reprezentarea: asigura mecanismul de acces si localizarea pe Internet.Ex(URL): http://example.org/wiki/Main_Pageface referinta la resursa /wiki/Main_Page , a carei reprezentare (in forma html), este obtinuta prin protocolul HyperText Transfer Protocol http://), de la o gazda (network host) a carei nume de domeniu este example.orgUn URN este un URI care identifica o resursa dupa nume (namespace).URI scheme: : [ ? ] [ # ] The scheme name consists of a sequence of characters beginning with a letter and followed by any combination of letters, digits, plus ("+"),period ("."), or hyphen ("-"). Although schemes are case-insensitive, the canonical form is lowercase and documents that specify schemes must do so with lowercase letters. It is followed by a colon (":").Ex. (schema name) : "http", "ftp", "mailto", "crid" or "file"hierarchical part = locatia, autoritatea foo://username:password@example.com:8042/over/there/index.dtb?type=animal&name=narwhal#nose \_/ \_______________/ \_________/ \__/ \___/ \_/ \______________________/ \__/ | | | | | | | | | userinfo hostname port | | query fragment | \________________________________/\_____________|____|/ \__/ \__/ | | | | | | | | | | | | | |scheme authority path | | interpretable as keys name \_______________________________________________|____|/ \____/ \_____/ | | | | | | | hierarchical part | | interpretable as values | | | | path interpretable as filename | | ___________|____________ | / \ / \ | urn:example:animal:ferret:nose interpretable as extension path _________|________ scheme / \ name userinfo hostname query _|__ ___|__ ____|____ _____|_____ / \ / \ / \ / \ mailto:username@example.com?subject=Topic