materialExtent

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > materialExtent

The quantity of the materials being described or an expression of the physical space they occupy.
Values expected to be one of these types
QuantitativeValue
Text
Used on these types
CreativeWork

Source

https://github.com/schemaorg/schemaorg/issues/1759

Examples

Example 1
Without Markup Microdata RDFa JSON-LD 
<div>
  Name: Assorted collection of items<br/>
  Extent: 285 A boxes, 8 OS boxes (plus 45 T boxes, 50 A boxes, 13 OS boxes / items uncatalogued)<br/>
</div>

<div itemscope itemtype="http://schema.org/CreativeWork">
  <link itemprop="additionalType" href="http://schema.org/ArchiveComponent"/>
  Name: <span itemprop="name">Assorted collection of items</span><br/>
  Extent: <span itemprop="materialExtent">285 A boxes, 8 OS boxes (plus 45 T boxes, 50 A boxes, 13 OS boxes / items uncatalogued)</span><br/>
</div>

<div  vocab="http://schema.org/" type="CreativeWork ArchiveComponent">
  Name: <span property="name">Assorted collection of items</span><br/>
  Extent: <span property="materialExtent">285 A boxes, 8 OS boxes (plus 45 T boxes, 50 A boxes, 13 OS boxes / items uncatalogued)</span><br/>
</div>

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": ["CreativeWork","ArchiveComponent"],
  "name": "Assorted collection of items",
  "materialExtent": "285 A boxes, 8 OS boxes (plus 45 T boxes, 50 A boxes, 13 OS boxes / items uncatalogued)"
}
</script>
Example 2
Without Markup Microdata RDFa JSON-LD 
<div>
  Name: Assorted collection of items<br/>
  Extent: 1 folder containing 5 design drawings<br/>
</div>

<div itemscope itemtype="http://schema.org/CreativeWork">
  <link itemprop="additionalType" href="http://schema.org/ArchiveComponent"/>
  Name: <span itemprop="name">Assorted collection of items</span><br/>
  Extent: <div>
            <div itemprop="materialExtent" itemscope itemtype="http://schema.org/QuantitativeValue">
              <span itemprop="value">1</span> <span itemprop="unitText">folder</span>
			</div>
			containing
            <div itemprop="materialExtent" itemscope itemtype="http://schema.org/QuantitativeValue">
              <span itemprop="value">5</span> <span itemprop="unitText">design drawings</span>
			</div>
          </div><br/>
</div>

<div vocab="http://schema.org/" type="CreativeWork ArchiveComponent">
  Name: <span property="name">Assorted collection of items</span><br/>
  Extent: <div>
             <div property="materialExtent" type="QuantitativeValue">
              <span property="value">1</span> <span property="unitText">folder</span>
			 </div>
			 containing
             <div property="materialExtent" type="QuantitativeValue">
              <span property="value">5</span> <span property="unitText">design drawings</span>
			 </div>
          </div><br/>
</div>

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": ["CreativeWork","ArchiveComponent"],
  "materialExtent": [
          {
            "@type": "QuantitativeValue",
            "unitText": "folder",
            "value": "1"
          },
          {
            "@type": "QuantitativeValue",
            "unitText": "design drawings",
            "value": "5"
          }
       ]
}
</script>