what are texcoord tags in mesh.xml file in Ogrexml format?

I exported a 3d model from blender 2.79 and using ogrexml import/export plugin.
but the texture will crash and UV map not working in that format.
I made the model by four parts head-body-hands-shoes and they have 4 material and 4 textures, so I made a texture atlas for it and join them in a mesh to More optimization.
I think removing other UV maps has a problem because when I check the model.mesh.xml in a note editor and every vertex has 3 texture coordinate tags and I compared it with a normal correct model that looks good in the blender and in ogrexml format, it has one texcoord tag inside of vertex tag.
1-what are texcoord tags? are they using for UV maps in ogrexml format?
2-how can I clear blend files from other unused uvMaps to avoid exporting them with the model?