rpcmethods: map out combinations of methods for property and file nodes

The file and property nodes have optional features that are provided by
additional methods. By providing them on that node these features
combined provide a different types of nodes. This maps out combinations
and provides names to them.

src/rpcmethods/file.md

@@ -13,6 +13,18 @@ method definition in this standard). That is because sometimes you want to allow
 a different levels of access to different users to same file (such as append to
 regular user, while write and truncate to super users).
 
+The combination of provided method for file node will define the expected
+functionality of the file. For the convinience of reader the following table is
+provided with various, but not all, types of file node modes. The methods
+`*:stat`, and `*:size` are always provided.
+
+|             | `*:crc` / `*:sha1` | `*:read` | `*:write` | `*:truncate` | `*:append` |
+|-------------|--------------------|----------|-----------|--------------|------------|
+| Read only   | ✔️                  | ✔️        | ❌        | ❌           | ❌         |
+| Fixed size  | ✔️                  | ✔️        | ✔️         | ❌           | ❌         |
+| Resizable   | ✔️                  | ✔️        | ✔️         | ✔️            | ✔️          |
+| Append only | ✔️                  | ✔️        | ❌        | ❌           | ✔️          |
+
 ## `*:stat`
 
 | Name   | SHV Path | Flags  | Access |
@@ -167,7 +179,7 @@ zero length bytes value is provided.
 | `write` | Any      |       | Write  |
 
 Write is optional method that can be provided if modification of the file over
-SHV RCP is allowed.
+SHV RPC is allowed.
 
 | Parameter    | Result |
 |--------------|--------|

src/rpcmethods/property.md

@@ -4,6 +4,16 @@ Property node is a convention where we associate value storage with some SHV
 path. The value can be received, optionally modified and its change can be
 signaled.
 
+The type of the property depends on the presence of the methods. The following
+table 
+
+|                                 | `*:get` | `*:get:*chng` | `*:set` |
+|---------------------------------|---------|---------------|---------|
+| Read only                       | ✔️       | ❌            | ❌      |
+| Read only with signaled change  | ✔️       | ✔️             | ❌      |
+| Read-write                      | ✔️       | ❌            | ✔️       |
+| Read-write with signaled change | ✔️       | ✔️             | ✔️       |
+
 ## `*:get`
 
 | Name  | SHV Path | Flags  | Access |