All-properties-shall-have-tags- (#1892)

docs-2.0/3.ngql-guide/1.nGQL-overview/3.graph-patterns.md

@@ -58,16 +58,18 @@ Patterns can also describe a vertex that has multiple tags. For example:
 
 Vertices and edges are the fundamental elements in a graph. In nGQL, properties are added to them for richer models.
 
-In the patterns, the properties can be expressed as follows: some key-value pairs are enclosed in curly brackets and separated by commas. For example, a vertex with two properties will be like:
+In the patterns, the properties can be expressed as follows: some key-value pairs are enclosed in curly brackets and separated by commas, and the tag or edge type to which a property belongs must be specified.
+
+For example, a vertex with two properties will be like:
 
 ```ngql
-(a {name: 'Andres', sport: 'Brazilian Ju-Jitsu'})
+(a:player{name: "Tim Duncan", age: 42})
 ```
 
 One of the edges that connect to this vertex can be like:
 
 ```ngql
-(a)-[{blocked: false}]->(b)
+(a)-[e:follow{degree: 95}]->(b)
 ```
 
 ## Patterns for edges

docs-2.0/3.ngql-guide/7.general-query-statements/2.match.md

@@ -195,7 +195,7 @@ nebula> MATCH (v:player) \
  In openCypher 9, `=` is the equality operator. However, in nGQL, `==` is the equality operator and `=` is the assignment operator (as in C++ or Java).
 
 
-You also use properties without specifying a tag to get vertices directly. For example, to get all the vertices with the vertex property value Tim Duncan.
+Use the `WHERE` clause to directly get all the vertices with the vertex property value Tim Duncan.
 
 ```ngql
 nebula> MATCH (v) \
@@ -414,7 +414,7 @@ nebula> MATCH (v:player{name:"Tim Duncan"})-[e:follow{degree:95}]->(v2) \
 ```
 
 
-You also use properties without specifying an edge type to get edges directly. For example, to get all the edges with the edge property value 90.
+Use the `WHERE` clause to directly get all the edges with the edge property value 90.
 
 ```ngql
 nebula> MATCH ()-[e]->() \