该查询应该返回foaf：E21_Person的名称，其中mus：U31_had_function是“ composer”。但是结果将返回所有foaf：name而不过滤函数。
这是我运行的查询：
CONSTRUCT {?F22_Self_Contained_Expression foaf:name ?composerName; mus:U41_has_catalogue_number ?catalogueNumber}
WHERE {
?F22_Self_Contained_Expression mus:U16_has_catalogue_statement/ecrm:P3_has_note ?catalogueNumber.
?F28_Expression_Creation efrbroo:R17_created ?F22_Self_Contained_Expression;
ecrm:P9_consists_of/ecrm:P14_carried_out_by/foaf:name ?composerName.
数据结构如下：
<http://data.doremus.org/artist/adebc97e-fd15-3094-b15b-a7443c26497f>
a ecrm:E21_Person ;
rdfs:label "Francesco Maria Piave" ;
ecrm:P100i_died_in <http://data.doremus.org/artist/adebc97e-fd15-3094-b15b-a7443c26497f/death> ;
ecrm:P131_is_identified_by "Piave, Francesco Maria (1810-1876)" ;
ecrm:P98i_was_born <http://data.doremus.org/artist/adebc97e-fd15-3094-b15b-a7443c26497f/birth> ;
schema:birthDate "1810"^^xsd:gYear ;
schema:deathDate "1876"^^xsd:gYear ;
foaf:firstName "Francesco Maria" ;
foaf:name "Francesco Maria Piave" ;
foaf:surname "Piave" .
<http://data.doremus.org/event/f7c6dbae-581e-3ac7-9d8e-d0f4d21d0fcf>
a efrbroo:F28_Expression_Creation ;
efrbroo:R17_created <http://data.doremus.org/expression/a92f029b-4616-325a-b526-52ec3a8e3a5c> ;
efrbroo:R19_created_a_realisation_of
<http://data.doremus.org/work/599f63b9-47ad-3591-993a-6729dc6b1cca> .
<http://data.doremus.org/event/dde04c04-5e86-3583-9f8f-8adfcbbf2564/activity/3>
a ecrm:E7_Activity ;
mus:U31_had_function <http://data.doremus.org/vocabulary/function/librettist> ;
ecrm:P14_carried_out_by <http://data.doremus.org/artist/adebc97e-fd15-3094-b15b-a7443c26497f> .
<http://data.doremus.org/event/dde04c04-5e86-3583-9f8f-8adfcbbf2564/activity/2>
a ecrm:E7_Activity ;
mus:U31_had_function <http://data.doremus.org/vocabulary/function/librettist> ;
ecrm:P14_carried_out_by <http://data.doremus.org/artist/b82c0771-5280-39af-ad2e-8ace2f4ebda3> .
<http://data.doremus.org/event/dde04c04-5e86-3583-9f8f-8adfcbbf2564/activity/1>
a ecrm:E7_Activity ;
mus:U31_had_function <http://data.doremus.org/vocabulary/function/composer> ;
ecrm:P14_carried_out_by <http://data.doremus.org/artist/b82c0771-5280-39af-ad2e-8ace2f4ebda3> .
<http://data.doremus.org/artist/b82c0771-5280-39af-ad2e-8ace2f4ebda3>
a ecrm:E21_Person ;
rdfs:label "Giuseppe Verdi" ;
ecrm:P100i_died_in <http://data.doremus.org/artist/b82c0771-5280-39af-ad2e-8ace2f4ebda3/death> ;
ecrm:P131_is_identified_by "Verdi, Giuseppe (1813-1901)" ;
ecrm:P98i_was_born <http://data.doremus.org/artist/b82c0771-5280-39af-ad2e-8ace2f4ebda3/birth> ;
schema:birthDate "1813"^^xsd:gYear ;
schema:deathDate "1901"^^xsd:gYear ;
foaf:firstName "Giuseppe" ;
foaf:name "Giuseppe Verdi" ;
foaf:surname "Verdi" .
我希望功能为“ composer”的人输出foaf：name