Total number of pages in a work in print; by convention, each page or partial page is counted as one. Electronic-only works do not traditionally have page counts.
Inside the <counts> container element are the counts of various components of the document: the generic count element <count> (for which the @count-type names what is being counted) and the specific named counting elements: the <fig-count> is the number of figures, the <table-count> is the number of tables, the <equation-count> is the number of display equations, the <ref-count> is either the number of references or (more properly) the number of citations in the bibliographic reference list, the <page-count> is the total page count, and the <word-count> is the number of words in the work.
The count elements are modeled as EMPTY elements that have no content but carry values on their attributes.
The <page-count> should not be used inside citations (<element-citation> or <mixed-citation>), instead use the element <size>.
<!ELEMENT page-count EMPTY >
This is an EMPTY element
<book dtd-version="1.0">
<book-meta>
<book-id book-id-type="publisher">handbook-648</book-id>
<book-title-group>
<book-title>The NCBI Handbook</book-title>
</book-title-group>
...
<counts>
<count count-type="contributors" count="2"/>
<fig-count count="98"/>
<table-count count="40"/>
<equation-count count="0"/>
<ref-count count="115"/>
<page-count count="532"/>
<word-count count="149852"/>
</counts>
</book-meta>
<front-matter>...</front-matter>
<book-body>...</book-body>
<book-back>...</book-back>
</book>
...
<counts>
<page-count count="1"/>
</counts>
<custom-meta-group>
<custom-meta>
<meta-name>crossmark</meta-name>
<meta-value>2013-02-15T11:32:17</meta-value>
</custom-meta>
</custom-meta-group>
</book-part-meta>
...