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Delete Specific Field Values

Description

In some cases, an infoton may have several values for the same field name. For example, a Person infoton might have several Telephone or Email field values.

Using the #markReplace operator to delete a field will delete all of its values.

If you only want to delete a subset of a field's multiple values, while retaining the other values, there are two ways to do this:

1. Use the JSON format to define values to delete.
2. Use the special #markDelete indicator.

Both methods are described in the following sections.

Syntax 1 (JSON Format)

URL: <cm-well-host>/<cm-well-path>

REST verb: POST

Mandatory parameters: data

---

Template:

curl -X POST <cm-well-host>/<cm-well-path>?data=<field name and values to delete, in JSON format>

URL example: N/A

Curl example (REST API):

curl -X DELETE '<cm-well-host>/example.org/JohnSmith?data={"name":["John","Johnnie"]}'

Parameters 1

Parameter	Description	Example
data	The field name and values to delete, in JSON format. Values are comma-separated.	{"name":["John","Johnnie"]}
priority	If this flag appears in an update call, that call receives priority relative to non-priority calls. To use this flag, you must also pass the X-CM-WELL-TOKEN request header, with a token that grants access to the priority feature. This feature should be used with discretion so as not to flood the priority queue.	/_in?format=ttl&priority...

Code Example 1

Call

curl -X DELETE '<cm-well-host>/example.org/JohnSmith?data={"name":["John","Johnnie"]}'

Results

{"success":true}

Syntax 2 (#markDelete Indicator)

URL: <CMWellHost>/_in

REST verb: POST

Mandatory parameters: N/A

---

Template:

curl -X POST <cm-well-host>/_in?format=<format> <infotonURI> <cmwell://meta/sys#markDelete> [ <field name and value pairs> ]

URL example: N/A

Curl example (REST API):

curl -X POST "<cm-well-host>/_in?format=turtle" --data-binary @curlInput.txt

File Contents

@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
    <http://example.org/Individuals/JohnSmith>
    <cmwell://meta/sys#markDelete> [
      vcard:EMAIL <mailto:jane.smith@example.org> ;
      vcard:EMAIL <mailto:jenny.smith@example.org> ]

Parameters 2

Parameter	Description	Values	Example	Reference
format	The format in which the triples are provided	n3, rdfxml, ntriples, nquads, turtle/ttl, trig, trix	format=n3	CM-Well Input and Output Formats
priority	If this flag appears in an update call, that call receives priority relative to non-priority calls. To use this flag, you must also pass the X-CM-WELL-TOKEN request header, with a token that grants access to the priority feature. This feature should be used with discretion so as not to flood the priority queue.	None	/_in?format=ttl&priority...	Query Parameters

Code Example 2

Call

curl -X POST "<cm-well-host>/_in?format=turtle" --data-binary @curlInput.txt

File Contents

Triples:

@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
    <http://example.org/Individuals/JohnSmith>
    <cmwell://meta/sys#markDelete> [
      vcard:EMAIL <mailto:jane.smith@example.org> ;
      vcard:EMAIL <mailto:jenny.smith@example.org> ]

Quads:

@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
    <http://example.org/Individuals/JohnSmith>
    <cmwell://meta/sys#markDelete> [
      vcard:EMAIL <mailto:jane.smith@example.org> <http://mySubGraph>;
      vcard:EMAIL <mailto:jenny.smith@example.org> <http://mySubGraph>]

Results

{"success":true}

Note

• You can delete only values with specific sub-graph labels by providing the label value as the 4th value of a field quad (see Quads example above).
• If you specify a quad format (e.g. format=nquads) but provide triples data, CM-Well infers <*> as the missing quad value, and therefore will delete all specified fields that have any quad value.
• The replace-mode flag and the #markDelete indicator should not be used in the same command. If they are, replace-mode overrides #markDelete.

Related Topics

Delete a Single Infoton

Delete Fields

Replace Field Values