Transfer Syntax is the language used in DICOM to describe the DICOM file format and the network transfer methods. 3 main variables are contained in the Transfer Syntax:
VR: Implicit/Explicit Endianism: Little-Endian/BigEndian Pixel Data Compression For DICOM Files, the Transfer Syntax is stored in the File Meta Header, and for networking it is negotiated between the SCU & SCP. For more information about how the negotiation happens and how to control the network transfer using Transfer Syntax can be found here.
UIDs are fundamental to DICOM and have many uses, including there being a unique one for each SOP Class and for each Composite Instance and each Normalised Instance.
There are several rules to be followed when making UIDs, and this page is a useful summary
General DICOM Rules Total length must be 1- 64 characters, including the stops Must contain only digits 0-9 and full stops Each numeric “component” (between stops) must be a valid and unambiguous integer number, and so must not have a leading zero (unless the whole component is zero), 1.
Web Access to DICOM Persistent Objects (WADO)
WADO is a protocol (defined in DICOM Part 18) for retrieving DICOM Composite Instances using the http or https protocols. It is simple to write a WADO server using DicomObjects - see the Example on the web
The Well-Known UIDs are Static Instance UID mostly used in normalised operations. The following is a list of all UIDs in DICOM