Add additional descriptions of the device

Author: petrvanekrobe

gdtf-spec.md

@@ -84,6 +84,8 @@ amendments) applies.
 
 - [Semantic Versioning 2.0](https://semver.org/)
 
+- IEC 60529 Degrees of protection provided by enclosures (IP Code)
+
 ## Terms and definitions
 
 For the purposes of this document, the following terms and definitions
@@ -976,10 +978,20 @@ The color rendering index does not have any children.
 #### General
 
 This section defines the general properties of the device type (XML node
-`<Properties>`). The Properties Collect currently does not have any XML
-attributes. The currently defined children nodes of properties collect
-are specified in [table 28](#user-content-table-28 ).
+`<Properties>`).
+
+The currently defined XML attributes of the
+Properties are specified in [table 29](#user-content-table-29 ).
+
+| XML Attribute Name | Value Type                          | Description                                                                 |
+|----|----|----|
+| IPRating    | [String](#user-content-attrtype-string )         | IP Rating of the device of the format of IEC 60529. Example: IP65  |
+| DistanceToFlammable       | [Float](#user-content-attrtype-float )    | Minimal distance in meter from flammable objects; Default value: 0   |
+| DistanceToIlluminated       | [Float](#user-content-attrtype-float )    | Minimal distance in meter from other objects; Default value: 0   |
 
+
+The currently defined children nodes of properties collect
+are specified in [table 28](#user-content-table-28 ).
 <div id="table-28">
 
 #### Table 28. *Properties Collect*