module mdsal161 {
    namespace "mdsal161";
    prefix "mdsal161";

    // Reported case:
    typedef revision-identifier {
        type string {
            pattern '\d{4}-\d{2}-\d{2}';
        }
    }

    grouping grp {
        leaf name {
            type string;
        }
        leaf revision {
            type union {
                type revision-identifier;
                type string { length 0; }
            }
        }
    }

    list with-grp {
        key "name revision";

        uses grp;
    }

    // Simpler case: same thing without the grouping
    list without-grp {
        key "name revision";

        leaf name {
            type string;
        }
        leaf revision {
            type union {
                type revision-identifier;
                type string { length 0; }
            }
        }
    }

    // Two different cases: the type is defined in a grouping typedef
    grouping grp-typedef {
        typedef revision-type {
            type union {
                type revision-identifier;
                type string { length 0; }
            }
        }

        leaf name {
            type string;
        }
        leaf revision {
            type revision-type;
        }
    }

    list with-grp-typedef {
        key "name revision";

        uses grp-typedef;
    }

    list without-grp-typedef {
        typedef revision-type {
            type union {
                type revision-identifier;
                type string { length 0; }
            }
        }

        key "name revision";

        leaf name {
            type string;
        }
        leaf revision {
            type revision-type;
        }
    }

    // Another set of cases: the type is externally typedef'd
    typedef ext-typedef {
        type union {
            type revision-identifier;
            type string { length 0; }
        }
    }

    grouping grp-ext {
        leaf name {
            type string;
        }
        leaf revision {
            type ext-typedef;
        }
    }

    list with-grp-ext {
        key "name revision";

        uses grp-ext;
    }

    list without-grp-ext {
        key "name revision";

        leaf name {
            type string;
        }
        leaf revision {
            type ext-typedef;
        }
    }
}