352911000119101: Primary malignant neoplasm of left optic nerve (disorder)

SNOMED CT Concept\Clinical finding (finding)\...

\Mass of body structure\Mass of body region\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of cranial nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Neurological lesion\Space-occupying lesion of nervous system\Neoplasm of nervous system\...

\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Neoplasm of cranial nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Neoplasm of central nervous system\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Central nervous system finding\Disorder of the central nervous system (disorder)\...

\Neoplasm of central nervous system\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Disorder of visual pathways\Disorder of optic nerve\...

\Disorder of left optic nerve (disorder)\Primary malignant neoplasm of left optic nerve

\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Eye / vision finding\Visual system disorder\Disorder of visual pathways\Disorder of optic nerve\...

\Disorder of left optic nerve (disorder)\Primary malignant neoplasm of left optic nerve

\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Primary malignant neoplasm (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Primary malignant neoplasm (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Malignant neoplastic disease (disorder)\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of cranial nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Visual system disorder\Disorder of visual pathways\Disorder of optic nerve\Disorder of left optic nerve (disorder)\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Visual system disorder\Disorder of visual pathways\Disorder of optic nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neuropathy (disorder)\Cranial nerve disorder\Neoplasm of cranial nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neuropathy (disorder)\Cranial nerve disorder\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neuropathy (disorder)\Cranial nerve disorder\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neuropathy (disorder)\Cranial nerve disorder\Disorder of optic nerve\Disorder of left optic nerve (disorder)\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neuropathy (disorder)\Cranial nerve disorder\Disorder of optic nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Malignant neoplasm of nervous system (disorder)\Primary malignant neoplasm of nervous system\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of cranial nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of cranial nerve\Malignant tumour of cranial nerve\Primary malignant neoplasm of cranial nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Malignant neoplasm of central nervous system (disorder)\Primary malignant neoplasm of central nervous system\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Disorder of visual pathways\Disorder of optic nerve\Disorder of left optic nerve (disorder)\Primary malignant neoplasm of left optic nerve
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Disorder of visual pathways\Disorder of optic nerve\Neoplasm of optic nerve (disorder)\Malignant tumor of optic nerve\Primary malignant neoplasm of optic nerve\Primary malignant neoplasm of left optic nerve

Status: current, Sufficiently defined by necessary conditions definition status (core metadata concept). Date: 31-Jul 2021. Module: SNOMED CT core

Descriptions:

Expanded Value Set

Outbound Relationships	Type	Target	Active	Characteristic	Refinability	Group	Values
Primary malignant neoplasm of left optic nerve	Is a	Primary malignant neoplasm of optic nerve	true	Inferred relationship	Some
Primary malignant neoplasm of left optic nerve	Associated morphology	primaire maligniteit	false	Inferred relationship	Some	1
Primary malignant neoplasm of left optic nerve	Finding site	Structure of left optic nerve (body structure)	true	Inferred relationship	Some	1
Primary malignant neoplasm of left optic nerve	Associated morphology	Malignant neoplasm (morphologic abnormality)	true	Inferred relationship	Some	1
Primary malignant neoplasm of left optic nerve	Pathological process (attribute)	Malignant proliferation of primary neoplasm (qualifier value)	true	Inferred relationship	Some	1
Primary malignant neoplasm of left optic nerve	Is a	Mass of body region	true	Inferred relationship	Some
Primary malignant neoplasm of left optic nerve	Is a	Disorder of left optic nerve (disorder)	true	Inferred relationship	Some

Inbound Relationships

Type

Active

Source

Characteristic

Refinability

Group

Reference Sets

Description inactivation indicator reference set

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Id	Description	Lang	Type	Status	Case?	Module
4545312015	Primary malignant neoplasm of left optic nerve	en	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
4545313013	Primary malignant neoplasm of left optic nerve (disorder)	en	Fully specified name	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
14511481000172113	tumeur maligne primitive du deuxième nerf crânien gauche	fr	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	Belgian module (core metadata concept)
14511491000172111	tumeur maligne primitive du nerf crânien II gauche	fr	Synonym (core metadata concept)	Active	Only initial character case insensitive (core metadata concept)	Belgian module (core metadata concept)
14511501000172118	néoplasme malin primitif du nerf optique gauche	fr	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	Belgian module (core metadata concept)
4708921000172112	primaire maligniteit van oogzenuw van linker oog	nl	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	Belgian module (core metadata concept)
4708931000172110	primaire maligne tumor van hersenzenuw II van linker oog	nl	Synonym (core metadata concept)	Active	Only initial character case insensitive (core metadata concept)	Belgian module (core metadata concept)
4708941000172115	primair maligne neoplasma van linker nervus opticus	nl	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	Belgian module (core metadata concept)
4708951000172118	primair maligne neoplasma van tweede hersenzenuw van linker oog	nl	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	Belgian module (core metadata concept)