At the end of the transformation we have RDF statements that represent the finding aid data itself, the cataloguing data for the top-level archival component (usually a "collection", DACS-wise), the cataloguing data of the enclosed components (usually a collection's series, subseries, etc), and the hierarchy between components.
For our model, the minimal expression of an EAD3 component is a <c> tag with an identifier attribute and a DACS cataloguing level attribute:
<c id="aspace_ref23_lnh" level="item">
<unitid>MDE_B017_F001_126</unitid>
</c>
Every archival component follows our model's basic patterns of having a URI, a type, and a classified_as property. For archival components:
* The `"id"` URI is derived from the component identifier: `http://data.duchamparchives.org/<organization>/archive/component/<unitid_tag_content>`
* `{ "type": "ManMadeObject" }` for components catalogued at the `item` level
* or, `{ "type": "PhysicalObject" }` for components catalogued at any other DACS level
* a classification as an archival thing (`aat:300375748`, "archives")
When this is rendered in JSON-LD we get:
{
"@context": "https://linked.art/ns/v1/linked-art.json",
"id": "http://data.duchamparchives.org/pma/archive/component/MDE_B017_F001_126",
"classified_as": [
{
"id": "aat:item",
"label": "item",
"type": "Type"
},
{
"id": "aat:300375748",
"label": "archives (groupings)",
"type": "Type"
}
]
}
Every component in an EAD/XML hierarchy can carry a cataloguing-level attribute intended for expressing the component's level within the hierarchy. These level classifications are passed on as AAT stubs of that level. For example:
{
"@context": "https://linked.art/ns/v1/linked-art.json",
"id": "http://data.duchamparchives.org/pma/archive/component/MDE_B017_F001_126",
"type": "ManMadeObject",
"classified_as": [
{
"id": "aat:item",
"label": "item",
"type": "Type"
},
{
"id": "aat:300375748",
"label": "archives (groupings)",
"type": "Type"
},
{
"id": "aat:300026877",
"label": "correspondence",
"type": "Type"
}
]
}
These classifications are rendered with the lowercase slugged stub of the level attribute (also addressing any non-ASCII characters or whitespace):
| EAD3 Tag | Classification |
|---|---|
<c level="fonds"> |
aat:300311705 |
<c level="collection"> |
aat:300026032 |
<c level="group"> |
aat:300026972 |
<c level="subgroup"> |
aat:300135016 |
<c level="series"> |
aat:300054631 |
<c level="file"> |
aat:scopenote |
<c level="item"> |
aat:related |
<c level="otherlevel" otherlevel="Object"> |
aat:object |
In EAD3 we can express an archival component's basic identifiers with a combination of <unitid> tags and a <unittitle>:
<c id="aspace_ref23_lnh" level="item">
<did>
<unittitle>Alexina Duchamp at Philadelphia Museum of Art exhibition standing near The Large Glass</unittitle>
<unitid>MDE_B017_F001_126</unitid>
<container id="aspace_ee2c950f6f2741ae317f124e42e0cd4c" label="Mixed Materials" localtype="box">17</container>
<container id="aspace_04257636d45150a17b00babb37d042c6" localtype="folder" parent="aspace_9ef5b4fd4ac5a29dd6272888874002bd">1</container>
</did>
</c>
Following our basic patterns these can be modelled as identifiers:
Name with the value of <unittitle>, classified preferred (aat:300404670)Identifier with the value of <unitid>, classified with a stub, aat:accessionIdentifier with the value of the <c> tag's id attribute, classified preferred (aat:300404670)Identifiers representing the box and folder locations, classified with stubs (aat:box and aat:folder)Identifier with the value of the component's sequence among its siblings, classified as the sequence (aat:300192339)The identifiers for an archival item should look something like:
{
"@context": "https://linked.art/ns/v1/linked-art.json",
"id": "http://data.duchamparchives.org/pma/archive/component/MDE_B017_F001_126",
"identified_by": [
{
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_475f21f96aeb4b46bb88b1eaa97d0a61/unittitle",
"type": "Name",
"value": "Alexina Duchamp at Philadelphia Museum of Art exhibition standing near The Large Glass"
},
{
"classified_as": [
{
"id": "aat:300404670",
"label": "preferred terms",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_475f21f96aeb4b46bb88b1eaa97d0a61/id",
"type": "Identifier",
"value": "aspace_475f21f96aeb4b46bb88b1eaa97d0a61"
},
{
"classified_as": [
{
"id": "aat:folder",
"label": "folder",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/container/aspace_281472aec2d4b6b005c495aa24072557",
"type": "Identifier",
"value": "1"
},
{
"classified_as": [
{
"id": "aat:box",
"label": "box",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/container/aspace_ee2c950f6f2741ae317f124e42e0cd4c",
"label": "Mixed Materials",
"type": "Identifier",
"value": "17"
},
{
"classified_as": [
{
"id": "aat:300192339",
"label": "sequences",
"type": "Type"
}
],
"type": "Identifier",
"value": "125"
},
{
"classified_as": [
{
"id": "aat:accession",
"label": "accession",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_475f21f96aeb4b46bb88b1eaa97d0a61/unitid/0",
"type": "Identifier",
"value": "MDE_B017_F001_126"
}
]
}
Most of the descriptive cataloguing in an EAD document becomes LinguisticObject nodes with classifications that roughly match the meaning of the descriptive tag. For example in this example document the <relatedmaterial> tag becomes a node classified as aat:related:
{
"@context": "https://linked.art/ns/v1/linked-art.json",
"id": "http://data.duchamparchives.org/pma/archive/component/MDE_B017_F001_126",
"referred_to_by": [
{
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_f936701a5829bcbd57f1b94da1601352/related/0",
"type": "LinguisticObject",
"classified_as": [
{
"id": "aat:related",
"label": "Related Material",
"type": "Type"
}
],
"value": "The Bride Stripped Bare by Her Bachelors, Even (The Large Glass)"
}
]
}
Individual EAD tags are classified with the following rubric:
| EAD3 Tag | Classification |
|---|---|
<prefercite> |
aat:300311705 ("citations") |
<abstract> |
aat:300026032 ("abstracts") |
<bioghist> |
aat:300026972 ("biography files") |
<processinfo> |
aat:300135016 ("archival processing") |
<arrangement> |
aat:300054631 ("classification") |
<scopecontent> |
aat:scopenote (stub) |
<relatedmaterial> |
aat:related (stub) |
XML/EAD documents represent the hierarchical 'belonging' relationships between components as a tree of nested children. Minimally this looks like:
<ead>
<archdesc level="collection">
<did>
<unittitle>Marcel Duchamp Exhibition Records</unittitle>
</did>
<dsc>
<c level="series">
<did>
<unittitle>Philadelphia Museum of Art, "Marcel Duchamp," 1973</unittitle>
</did>
<c level="item">
<did>
<unittitle>Alexina Duchamp at Philadelphia Museum of Art exhibition standing near The Large Glass</unittitle>
</did>
</c>
</c>
</dsc>
</archdesc>
</ead>
That is, Marcel Duchamp Exhibition Records contains Philadelphia Museum of Art, "Marcel Duchamp," 1973, which contains a photograph (whose title is catalogued as "Alexina Duchamp at Philadelphia Museum of Art exhibition standing near The Large Glass").
These relationships are expressed two ways in JSON-LD. First, children describe the path to their parents with a part_of property that contains the nodes of all the child's ancestors. So:
{
"part_of": [
{
"classified_as": [
{
"id": "aat:300375748",
"label": "archives (groupings)",
"type": "Type"
},
{
"id": "aat:collection",
"label": "collection",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/collection/marcel-duchamp-exhibition-records",
"identified_by": [
{
"classified_as": [
{
"id": "aat:300404670",
"label": "preferred terms",
"type": "Type"
}
],
"id": "_:b98",
"type": "Name",
"value": "Marcel Duchamp Exhibition Records"
}
],
"part": [
"http://data.duchamparchives.org/pma/archive/component/aspace_ref571_il6",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref13_x97",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref604_xlc",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref152_nys",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref584_xko",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref119_3fj",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref543_pjn",
"http://data.duchamparchives.org/pma/archive/component/aspace_2d01407c020feaeb17422e7b223c30c4",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref212_493"
],
"type": "PhysicalObject"
},
{
"classified_as": [
{
"id": "aat:300375748",
"label": "archives (groupings)",
"type": "Type"
},
{
"id": "aat:series",
"label": "series",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_ref13_x97",
"identified_by": [
{
"classified_as": [
{
"id": "aat:300404670",
"label": "preferred terms",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_ref13_x97/unittitle",
"type": "Name",
"value": "Philadelphia Museum of Art, \"Marcel Duchamp,\" 1973"
}
],
"part": [
"http://data.duchamparchives.org/pma/archive/component/aspace_ref95_m2f",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref83_69y",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref111_hr7",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref107_cc5",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref49_xn6",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref75_pyz",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref101_iuo",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref43_zej",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref77_kwq",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref55_jgj",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref117_ybn",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref99_gt7",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref41_176",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref105_884",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref52_j0b",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref97_r8k",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref91_c2g",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref17_pp7",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref93_ptc",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref25_7vl",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref85_l0s",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref113_bv6",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref115_3zi",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref37_i2b",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref89_nw6",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref19_gmp",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref28_m4u",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref109_b9d",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref23_lnh",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref73_ncm",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref87_u6h",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref69_o2r",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref21_6hu",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref59_cwo",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref67_wpo",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref57_xzv",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref34_2pu",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref39_0z1",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref71_geh",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref15_b6o",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref103_ocl",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref31_rdk",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref63_xk6",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref47_mv8",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref45_u7w",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref65_t6p",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref61_h5s",
"http://data.duchamparchives.org/pma/archive/component/aspace_ref80_zok"
],
"type": "PhysicalObject"
}
]
}
Likewise the document that expresses collection and finding aid information shows the full hierarchy from the top down with a part property:
{
"@context": "",
"id": "http://data.duchamparchives.org/pma/archive/collection/marcel-duchamp-exhibition-records",
"type": "PhysicalObject",
"classified_as": [
{
"id": "aat:300375748",
"label": "archives (groupings)",
"type": "Type"
},
{
"id": "aat:collection",
"label": "collection",
"type": "Type"
}
],
"part": [
{
"classified_as": [
{
"id": "aat:300026877",
"label": "correspondence",
"type": "Type"
},
{
"id": "aat:item",
"label": "item",
"type": "Type"
},
{
"id": "aat:300375748",
"label": "archives (groupings)",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_ref23_lnh",
"identified_by": [
{
"classified_as": [
{
"id": "aat:300404670",
"label": "preferred terms",
"type": "Type"
}
],
"id": "http://data.duchamparchives.org/pma/archive/component/aspace_ref23_lnh/unittitle",
"type": "Name",
"value": "Alexina Duchamp at Philadelphia Museum of Art exhibition standing near The Large Glass"
},
]
}
]
}
crm:P9_is_part_of predicates.The mappings for each field in the model are available in the data review portion of this documentation website: