AppleScript – How can I _get_ UI elements' names, attributes, properties, classes programmatically without "guessing" via AccessibilityInspector?
This is a "study" –an attempt– to find pragmatic ways to identify and "use" AS's UI elements:

Code below works in principle but must be adapted to individ. case (e.g.: find second image).
I am not an IT professional so I apologize for a distinct lack of "on error" code – Sorry!
… nor is this meant to be a "Comprehensive Guide" on AppleScript, rather a "Travel Journal".    

(BTW: AirBook, i7-3740QM, 8GB. Repeat-loops on "entire contents" may take 70+ sec's.
System: MacOS X High Sierra 10.13.6, Applescript 2.7. Commands may vary with versions.) 

I started my search here at Ask Different, my below "results" mostly apply to thread:
How to know the name of UI elements using Accessibility inspector (or any other tool)


  1) How many˜˜ UI elements are there in a "Ask Different" window? …


"Frame":    tell application "System Events" to tell process "Safari"
                set frontmost to true
                set i to 0
Start:          set listItems to (entire contents of window 1 as list)
Next:           repeat with thisItem in listItems
                    set i to i + 1
                end repeat
            end tell
"Result" in
ScriptEditor:   951                -- display dialog ("UIElems:" &amp; i)
               ¯¯¯¯¯



  How many˜˜ elements are there in which different classes? …    


Classes:    if (class of item i of listItems is static text) then
                set classCount to classCount +1    
            end if
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"Results" in ScriptEditor:
static text (376), group˜˜ (337), UI element (166), button (51),
radio button (12), menu button (6), image (2)
(1 inst. each:) toolbar, scroll area, scroll bar, text area, text field, 
tab, checkbox, splitter group, splitter    


(˜˜ The "static text" you are just now reading is at the end of this "upper" hierarchy:
Group&gt; WebArea&gt; ScrollArea&gt; Group&gt; Group&gt; TabGroup&gt; SplitterGroup&gt; Window
Several levels contain ≈400 real elements: every paragraph &amp; bullet point is a StaticText !)
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  2) How to identify e.g. those 2 images within 951 UI elements &amp; what to do:    


&nbsp; (From here on only differing code-parts, e.g. "Next" are posted; _/¯ = line break.)

Next:       set imgNums to {}
            repeat with thisItem in listItems
                set i to i + 1
Then:           if (class of item i of listItems is image) then
                    set imgNums to imgNums &amp; i
            end repeat
            return imgNums    _/¯    end tell
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"Result" in
ScriptEditor:   {111, 255}     (≈ 70 sec.! Searching 951 items is tedious…)
                ¯¯¯¯¯¯¯¯¯¯



  … or just "context" the first …      (≈ 7 sec.!)


Next:           if (class of item i of listItems is image) then exit repeat
            end repeat
Then:       tell thisItem to perform action "AXShowMenu"    _/¯    end tell


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  3) How to get at AppleScript's "verbal description" of a UI element?


Next:       repeat with thisItem in listItems    _/¯    set i to i + 1
Then:           if (class of item i of listItems is image) then
                    return (item i of listItems as list)
                    exit repeat
                end if    _/¯    end repeat    _/¯    end tell
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"Result" for image 1 in ScriptEditor:
image 1 of group 15 of group 6 of UI element 1 of scroll area 1 ¬
of group 1 of group 1 of tab group 1 of splitter group 1 of window ¬
"applescript - How to know the name of UI elements using Accessibility ¬
inspector (or any other tool) - Ask Different" of application process ¬
"Safari" of application "System Events"
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[Last three lines may be shortened to "window 1" – it's still in front …]


– which is this image …  … of the above mentioned thread.
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  4) Which attributes are possible for an element, which are factual properties?


Then:           if (class of item i of listItems is image) then ¬
                return (name of attributes of thisItem as list)
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"Result" for "attributes" in ScriptEditor:
"AXFocused", "AXAccessKey", "AXTitle", "AXElementBusy", "AXPosition", ¬
"AXLinkedUIElements", "AXSelected", "AXLanguage", "AXStartTextMarker", ¬
"AXEnabled", "AXEditableAncestor", "AXHighestEditableAncestor", ¬
"AXVisited", "AXDOMIdentifier", "AXHelp", "AXURL", "AXChildren", "AXRole", ¬
"AXParent", "AXSelectedTextMarkerRange", "AXTopLevelUIElement", ¬
"AXDOMClassList", "AXSubrole", "AXDescription", "AXFocusableAncestor", ¬
"AXValue", "AXBlockQuoteLevel", "AXRoleDescription", "AXSize", "AXWindow", ¬
"AXEndTextMarker", "AXFrame"



  Which are the factual properties of "image 1"?


Next:           if (class of item i of listItems is image) then ¬
                return (properties of thisItem as list)
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"Result" for "properties" in ScriptEditor:
missing value, m.v, {382, 790}, image, "enter image description here", ¬
"Bild", false, "", {241, 118}, "", {}, true, m.v., "AXImage", "", m.v., ¬
false, m.v., "enter image description here"


&nbsp; Obviously factual properties are not corresponding directly to attributes (19 to 32).    


  But some attributes actually can return values if asked directly:


Then:       end repeat
            return value of attribute "AXFrame" of thisItem  _/¯  end tell
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"Result" for "AXFrame" in ScriptEditor:   {382, 790, 623, 908}



  Which property is assigned to which attribute? (For exact "AX…" name, see appendix!)
  ... easy solution, found on Apple's developer pages:


Next:       if (class of item i of listItems is image) then
                tell item i of listItems to properties
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"Result" for "Bild" in ScriptEditor:    
minimum value:missing value, orientation:m. v., position:{382, 790}, ¬
class:image, accessibility description:"enter image description here", ¬
role description:"Bild", focused:false, title:"", size:{241, 118}, ¬
help:"", entire contents:{}, enabled:true, maximum value:m. v., ¬
role:"AXImage", value:"", subrole:m. v., selected:false, name:m. v., ¬
description:"enter image description here"    


Well, apparently Apple's own simple command "properties" also returns terms that are actually higher level, like "class:image" and "entire contents:{}".
If you are interested in learning which properties are assigned to which actual attributes try the "appendix solution" (e.g.> "AXFrame:{382, 790, 623, 908}").
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  Which "actions" belong to an element (AXPress, AXShowMenu…) ?
  


&nbsp; I DuckDuckGo[ogle]'d (DD'went?) and found a list of "AXActionConstants" on Apple's site:        

&nbsp; &nbsp;  "AXShowMenu" &nbsp; &nbsp;  "AXPress" &nbsp; &nbsp;  "AXCancel" &nbsp; &nbsp;  "AXConfirm"    

&nbsp; &nbsp;  "AXDecrement" &nbsp; &nbsp;  "AXIncrement" &nbsp; &nbsp;  "AXShowAlternateUI" &nbsp; &nbsp;  "AXShowDefaultUI"    

&nbsp; &nbsp;  "AXPick" &nbsp; &nbsp; &nbsp; Choose a UIElement, like menu item    

&nbsp; &nbsp;  "AXRaise" &nbsp; &nbsp;Cause a window to become as frontmost as possible    

&nbsp; &nbsp;  "AXZoomWindow"  &nbsp; &nbsp;Zoom a window to "desktop dimensions" but NOT to "fullscreen".


  &nbsp; &nbsp;&nbsp; NEW! … found action "AXZoomWindow" through UIElementInspector°° © Apple Inc. 2010


. 


  
  How are menu items addressed best?    
  


&nbsp; (I will soon add my view/findings on these remaining issues.)

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  How "different" are classes –and UI elements– in various apps? 
  



"TextEdit" is an example for minimalistic "functions" of an application window. (Be aware that
its tools windows (Fonts etc.) have UI elements of their own, many more than the main app!)
Its top "bar" consists of 3 coloured buttons, an image representing the document, its title as static text and a tiny down-arrow, a menu button.
Apart from these there are (potentially) 2 scroll areas (right &amp;
bottom) with scroll bars, also value indicators (their size), and
last not least its "contents", a text area.    

Classes of window 1 of TextEdit / Finder / iTunes:
set classNum to classNum &amp; (class of item i of listItems)
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 
"Result" for "TextEdit" (16):
button (7), scroll bar (2), scroll area, text area, value indicator, 
menu button, image, static text
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 
"Result" for "Finder" window in list view with left area with 
"devices" etc. , 11 files (208):
UI element (49), static text (49), image (27), row (26), button (19),
text field (12), group (6), radio button (4), column (4), ...
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 
"Result" for "iTunes" (26):
button (12), radio button (3), static text (3), pop up button (2), 
radio group (2), slider, value indicator, scroll area, text field

"Finder" in list view shows icons &amp; tools (= images), files have names, date etc. (static text), tools are also buttons, file names are also text fields (rename).
"iTunes" (with no TV items "installed") has got 2 pop up buttons (1: music, movies, TV / 2: next, history, song text) plus several sorts of navigation buttons.
All of these applications, though, also have hundreds of menu items: menus, sub-menus, sub-sub-…menus (TextEdit ≈ 350, Finder ≈ 430).   


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&nbsp; &nbsp; A P P E N D I X
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  Older code to get at "assignations" – but returns exact name! ... THAT took some testing:*


Next:       if (class of item i of listItems is image) then
                repeat with name in (attributes of thisItem as list)
                    try
                        if value of name is "Bild" then exit repeat
                    end try
                end repeat    _/¯    exit repeat    _/¯    end if
            try
                i &amp; k &amp; item k of (name of attributes of thisItem as list)
            end try
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"Result" for "Bild" in ScriptEditor:    {111, 28, "AXRoleDescription"}
 (Incl.: # of UI element, # of attribute, name of attribute) 
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 ({382, 790} =&gt; AXPosition, {241, 118} =&gt; AXSize, "AXImage" =&gt; AXRole …)    


&nbsp; The try-block is necessary since some value-less attributes otherwise cause errors.
&nbsp; This search on sample page took ≈ 9s. (#111) on THIS page ≈ 135s. (#767) !
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