You can get a list of all annotations using "AnnotationList", and "AnnotationInfo" returns a keyword string list including the "TYPE" item so you can check each annotation to see if it's a tag.
AnnotationInfo also has a "TEXT" keyword that tells you the text content of the tag...while looping through and counting the tags you could read their contents and append them to a text wave. I'm not sure I get what you mean by storing the positions in the wave. Is the text content of the tags a string telling you what their position is, or are you trying to extract a position from the numerical values in the original data?
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