I'm using an OASIS v 1.1 compatible resolver (Norm Walsh's XMLResolver in conjunction with the catalog below. However, I'm pretty sure I've made some sort of obvious error here (this is the first time I've needed to use v 1.1 features) since attempting to resolve OxChapML.dtd fails. Can anyone see something obviously wrong with this? Or even subtly wrong?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE catalog PUBLIC "-//OASIS//DTD XML Catalogs V1.1//EN"
         "http://www.oasis-open.org/committees/entity/release/1.1/catalog.dtd">
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
        <group  xml:base="file:///Volumes/Ac-EDP/DTG/SP%20DTD%20management/OUP_DTD/">
                <public publicId="-//OXFORD//DTD OXCHAPML//EN" uri="OxChapML.dtd"/>
                <public publicId="-//OXFORD//DTD OXENCYCLML//EN" uri="xEncyclML.dtd"/>
                <public publicId="-//OXFORD//DTD OXLAWML//EN" uri="OxLawML.dtd"/>
                <public publicId="-//OXFORD//DTD OXSTRUCTML//EN" uri="OxStructML.dtd"/>
                <public publicId="-//OXFORD//DTD OXLAWREPML//EN" uri="OxLawRepML.dtd"/>
                <public publicId="-//OXFORD//DTD OXBILINGML//EN" uri="OxBilingML.dtd"/>
                <public publicId="-//OXFORD//DTD OXMONOLINGML//EN" uri="OxMonolingML.dtd"/>
                <public publicId="-//OXFORD//DTD TIMELINES//EN" uri="timelines.dtd"/>
                <systemSuffix OxChapML.dtd" systemIdSuffix="OxChapML.dtd"/>
                <systemSuffix uri="xEncyclML.dtd" systemIdSuffix="xEncyclML.dtd"/>
                <systemSuffix systemIdSuffix="OxLawML.dtd" uri="OxLawML.dtd"/>
                <systemSuffix systemIdSuffix="OxStructML.dtd" uri="OxStructML.dtd"/>
                <systemSuffix systemIdSuffix="OxLawRepML.dtd" uri="OxLawRepML.dtd"/>
                <systemSuffix systemIdSuffix="OxBilingML.dtd" uri="OxBilingML.dtd"/>
                <systemSuffix systemIdSuffix="OxMonolingML.dtd" uri="OxMonolingML.dtd"/>
                <systemSuffix systemIdSuffix="timelines.dtd" uri="timelines.dtd"/>
        </group>        
</catalog>