Model attributes are defined by declaring the Type and the Name of each attribute. For example: <Integer name="currentTemp"/>. Integer is a system-defined type. This definition declares an entity of the Type (pattern) Integer with the name of "currentTemp" as an attribute of the Model.
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1. Atom. An attribute defined by a type which contains only one slot implicitly named “value”. (Atomic types are also called Primitive primitive types and are pre-defined by the system. For example, Number is an atomic type. All atomic types inherits from the type "Atom".) TQLEngine currently does not support user-defined atomic types.
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| System Tag Name | Description |
|---|---|
| Value | The value of the attribute is stored in "Value". This is often specified by the user at the time of create query (instantiation) |
| Known | Applicable to ThingModel/AppModel - this is the value that is only set by the output of Actions. Known CANNOT be set using CRUD operations (Create / Update) via TQL Queries. The system also maintains a "Known" for DataModel attributes, for consistency purposes, but it will always be the same as Value. |
| Version | The version number of the attribute. This number is automatically incremented each time the value changes. |
| Timestamp | Unix epoch time at the time (in millisecond) of the attribute creation. For example: Timestamp value1457663102004 is same as Fri, 11 Mar 2016 02:25:02 GMT |
| Datetime | Formatted data time value of the attribute creation. For example:2016-03-10 18:25:02.004 |
| QName | Fully qualified name of the attribute. <NamSpace>.<Domain>.<ModelName>.<AttributeName>. For example SimpleModel.MyModels.VendorInfo.vendorName given that VendorInfo is defined within Namespace - SimpleModel, with Domain as MyModels and DataModel Name as VendorInfo |
| FName | Given name of the attribute name. |
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