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To see if an attribute is in a tag array, the TagInArray() function is

    /* See if the listview labels attribute is located in a tag array */
    if (TagItemArray(GTLV_Labels, tags))
        /* Yes, the attribute is in the list */
        /* No, the attribute isn't in the list */

The FindTagItem() function will return a pointer to the actual tag that
has the desired attribute.  This allows you to manipulate the tag or to
determine if the attribute exists but just has a NULL value.

    struct TagItem *tag;

    /* See if they are trying to set a sound */
    if (tag = FindTagItem(MGA_Sound, attrs))
        /* Set the sound attribute to point to the specified sound data */
        tag->ti_Data = sound;