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Hiện nay, họ cùng tồn tại một chút không dễ nắm bắt với Web, kể từ khi họ hoạt động không gian về cơ bản bên ngoài địa chỉ Web chưa thực hiện một số chức năng tương tự như đề xuất các dịch vụ Web (WS). DS và RPC các ứng dụng thường sử dụng giao thức độc quyền | Enhancing the Web 17 Services on the Web The issues of distributed services DS and remote procedure calls RPC constitute a kind of parallel development to the previously considered Web extensions and are also considered a future part of the Semantic Web. At present they coexist somewhat uneasily with the Web since they operate fundamentally outside Web address space yet fulfill some of the same functionality as the proposed Web Services WS . DS and RPC applications often use proprietary protocols are highly platform dependent and are tied to known endpoints. WS implementations function within the Web address space using Web protocols and arbitrary endpoints. They also differ from DS and RPC remote operation work in that WS transactions are less frequent slower and occur between non-trusted parties. Issues such as proof of delivery become important and various message techniques can become part of the relevant WS protocols. Further discussion of these issues is deferred to later chapters. Instead the next few sections trace the conceptual developments that underpin the Semantic Web. From Flat Hyperlink Model In the Beginning was the Hyperlink. The click-to-browse hyperlink that core convention of text navigation and ultimately of Web usability is in reality a key-data pair interpreted in a particular way by the client software. It reads as a visible anchor associated with a hidden representation of a Web destination usually the URL form of a URI . The anchor can be any structural element but is commonly a selection of text or a small graphic. By convention it is rendered visually as underlined or framed at least by default though many other rendering options are possible. Bit 1.10 Good user interface design imbues simple metaphors with the ability to hide complex processing The clicked text hyperlink in its basic underlined style might not have been visually very pleasing yet it was easily implemented even in feature-poor environments. Therefore it quickly became .
