Are those <a id="GBS...."/> the actual Google Play page maps? I ask because I downloaded a free Google Play book (Bram Stoker's "Dracula"), added it to Calibre and ran Modify Epub on it. I've put the whole log, below, but for our purposes here, the important part is:
Code:
Looking for Google Play pagemaps
Removing Google Play pagemap file: Ops/_page_map_.xml
Manifest item removed: _page_map_.xml (_page_map_)
It found and removed the page map file and manifest item, but did nothing about those anchor tags. The book is in epub2 format (not epub3) and the anchors are non-self-closing. But, after the run, they got converted to self-closing and another run of Modify Epub still didn't do anything with the tags.
This isn't the end of the world for me. If those kinds of tags get in my way, I can always run some easy regex to move or clean them out. But, what I'm seeing with Modify Epub isn't what I'm expecting. But, then, it could just be that I don't understand what's what. However, the help file says the option should remove both the files and the anchors. It doesn't seem to be doing that latter.
Code:
Modify ePubs version (1, 8, 1)
Logfile for book ID 967 (Dracula / Bram Stoker)
Job details 967
Modifying: C:\Users\Dave\AppData\Local\Temp\calibre__mkrg5gl\wr0tmml8_modify_epub\967.epub
Updating metadata and cover
Parsing xml file: Ops/volume.opf
Parsing xml file: Ops/toc.ncx
Looking for redundant entries in manifest
Looking for unmanifested files
Looking for broken links in the NCX
ncx name: Ops/toc.ncx
Looping over ncx entries
Looking for Adobe xpgt files and links to remove
Looking for pagemaps
Looking for Google Play pagemaps
Removing Google Play pagemap file: Ops/_page_map_.xml
Manifest item removed: _page_map_.xml (_page_map_)
Looking for Adobe DRM meta tags to remove
Looking for legacy jackets
Adding or updating jacket
Manifest item added: jacket.xhtml (calibre_jacket)
Spine item inserted: calibre_jacket at pos: 1
Looking for html pages containing only broken image links
Looking for non dc: elements in manifest
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Removing child: {http://www.idpf.org/2007/opf}meta
Looking for html files to remove charset meta tags/encode to utf-8
Switched to UTF-8 encoding for: Ops/001.html
Switched to UTF-8 encoding for: Ops/002.html
Switched to UTF-8 encoding for: Ops/003.html
Switched to UTF-8 encoding for: Ops/004.html
Switched to UTF-8 encoding for: Ops/005.html
Switched to UTF-8 encoding for: Ops/006.html
Switched to UTF-8 encoding for: Ops/007.html
Switched to UTF-8 encoding for: Ops/008.html
Switched to UTF-8 encoding for: Ops/009.html
Switched to UTF-8 encoding for: Ops/010.html
Switched to UTF-8 encoding for: Ops/011.html
Switched to UTF-8 encoding for: Ops/012.html
Switched to UTF-8 encoding for: Ops/013.html
Switched to UTF-8 encoding for: Ops/014.html
Switched to UTF-8 encoding for: Ops/015.html
Switched to UTF-8 encoding for: Ops/016.html
Switched to UTF-8 encoding for: Ops/017.html
Switched to UTF-8 encoding for: Ops/018.html
Switched to UTF-8 encoding for: Ops/019.html
Switched to UTF-8 encoding for: Ops/020.html
Switched to UTF-8 encoding for: Ops/021.html
Switched to UTF-8 encoding for: Ops/022.html
Switched to UTF-8 encoding for: Ops/023.html
Switched to UTF-8 encoding for: Ops/024.html
Switched to UTF-8 encoding for: Ops/025.html
Switched to UTF-8 encoding for: Ops/026.html
Switched to UTF-8 encoding for: Ops/027.html
Switched to UTF-8 encoding for: Ops/028.html
Switched to UTF-8 encoding for: Ops/029.html
Switched to UTF-8 encoding for: Ops/030.html
Switched to UTF-8 encoding for: Ops/031.html
Switched to UTF-8 encoding for: Ops/032.html
Looking for embedded fonts
Looking for css @font-face style declarations
Looking for inline @font-face style declarations
Looking for CSS margins
Modified CSS margins in: Ops/cover.css
Modified CSS margins in: Ops/style.css
Looking for inline javascript blocks to remove
Looking for .js files to remove
Stripping Kobo remnants
Stripped Kobo spans in: Ops/001.html
Stripped Kobo spans in: Ops/002.html
Stripped Kobo spans in: Ops/003.html
Stripped Kobo spans in: Ops/004.html
Stripped Kobo spans in: Ops/005.html
Stripped Kobo spans in: Ops/006.html
Stripped Kobo spans in: Ops/007.html
Stripped Kobo spans in: Ops/008.html
Stripped Kobo spans in: Ops/009.html
Stripped Kobo spans in: Ops/010.html
Stripped Kobo spans in: Ops/011.html
Stripped Kobo spans in: Ops/012.html
Stripped Kobo spans in: Ops/013.html
Stripped Kobo spans in: Ops/014.html
Stripped Kobo spans in: Ops/015.html
Stripped Kobo spans in: Ops/016.html
Stripped Kobo spans in: Ops/017.html
Stripped Kobo spans in: Ops/018.html
Stripped Kobo spans in: Ops/019.html
Stripped Kobo spans in: Ops/020.html
Stripped Kobo spans in: Ops/021.html
Stripped Kobo spans in: Ops/022.html
Stripped Kobo spans in: Ops/023.html
Stripped Kobo spans in: Ops/024.html
Stripped Kobo spans in: Ops/025.html
Stripped Kobo spans in: Ops/026.html
Stripped Kobo spans in: Ops/027.html
Stripped Kobo spans in: Ops/028.html
Stripped Kobo spans in: Ops/029.html
Stripped Kobo spans in: Ops/030.html
Stripped Kobo spans in: Ops/031.html
Stripped Kobo spans in: Ops/032.html
Looking for files to remove: ['iTunesMetadata.plist', 'iTunesArtwork']
Looking for files to remove: ['META-INF/calibre_bookmarks.txt']
Looking for files to remove: ['.DS_Store', 'thumbs.db']
Looking for unused images
Stripping spans
ePub updated in 0.47 seconds