6.1 Mapping of basic data types

oneM2M has defined the data types that describe the format of the value stored at the attribute. Those oneM2M data types are listed in the below table, and mapped to the data types specified by OMA Lightweight M2M 1.0 [5] (shortened in OMA LwM2M).

Table 6.1-1 Basic data types

oneM2M Data Types	Mapping to data types in OMA LwM2M	description
xs:string	String	UTF-8 string.
xs:integer	Integer	ASCII signed integer 1, 2,4 or 8 bytes.
xs:boolean	Boolean	Data type for BooleanASCII value 0 or 1.
xs:float	Float	A 32 or 64-bit floating point value. The valid range of the value for a Resource SHOULD be defined.
xs:base64Binary	Opaque	A sequence of binary octets, the minimum and/or maximum length of the octets MAY be defined.
xs:dateTime	Time	Unix Time. A signed integer representing the number of seconds since Jan 1st, 1970 in the UTC time zone.
The mgmtLink attribute in the <mgmtObj> Resource	Objlink	The OMA LwM2M Objlink data type describes the format of a reference to an Object Instance. The mgmtLink attribute in the <mgmtObj> Resource supports the hierarchy of <mgmtObj> Resource.