xhr1: Overview.src.html
    python preprocess.py 1
xhr2: Overview.src.html
    python preprocess.py 2

Overview-XHR1.html: xhr1 data Makefile
    $(ANOLIS) --output-encoding=ascii --omit-optional-tags --quote-attr-values \
    --w3c-compat --enable=xspecxref --enable=refs  $< $@
Overview-XHR1.html: xhr2 data Makefile
    $(ANOLIS) --output-encoding=ascii --omit-optional-tags --quote-attr-values \
    --w3c-compat --enable=xspecxref --enable=refs $< $@