Neos.Media/Classes/Domain/Model/AssetCollection.php
public function removeTag(Tag $tag)
    {
        if ($this->tags->contains($tag)) {
            $this->tags->removeElement($tag);
            return true;
        }
        return false;
    }
public function removeTag(Tag $tag)
    {
        if ($this->tags->contains($tag)) {
            $this->tags->removeElement($tag);
            return true;
        }
        return false;
    }
public function removeTag ( Tag $ tag ) { if ( $ this -> tags -> contains ( $ tag ) ) { $ this -> tags -> removeElement ( $ tag ) ; return true ; } return false ; }
Remove a single tag from this asset

@param Tag $tag
@return boolean
Remove a single tag from this asset