Table 7.

The description of ecgML: Waveforms element

Waveforms	A 2-D plot with an X and Y axis is used to display the ECG waveform data. Refer to FDA XML Data Format Design Specification (revision C).
Element/attribute	Description/Origin	Required	Values/Data Type	Example
XValues	Describe the X-axis domain
XOffset	Offset from the StartTime.	Required	time	00:23:10
Duration	Duration of the each record.	Required	time	00:00:10
SampleRate	Sample rate in Hz for ECG records.	Required	unsignedInt	500
YValues	Describe the Y-axis domain.
unit	Name of base unit for Y-axis.	Required	Use UCUM when appropriate.	mV
FileLink	A reference to an external file storing ECG data.	Optional	string
RealValue	A list of actual value of ECG data
From	Offset from the origin of the x axis to the beginning of waveform	Required	time or samples	20:00:00
To	Offset from the origin of the x axis to the ending of waveform	Required	time or samples	21:00:04
Data	The list of Y values separated by white space	Required	A list of float values	1.25 2.23 3.2
Comment	Comments on the format, e.g. separated by a specific delimiter	Optional	string	separated by white spaces
Binary Data	Binary representation of ECG data
encoding	Encoding scheme for embedding the binary data within XML document	Required	Base64/Hexidecimal	Base64
From	Offset from the origin of the x axis to the beginning of waveform	Required	time or samples	00:00:00
To	Offset from the origin of the x axis to the ending of waveform	Required	time or samples	12:00:04
Scale	Scale factor to use to convert a binary data into a real value	Required	float	1.0
Data	Encoded binary ECG data	Required	string	A923B420