id 

<p>The xsd:ID type is an alphanumeric identifier, starting with a letter. Port IDs often contain the ID of their glyph, followed by a local port number (e.g. glyph4.1, glyph4.2, etc.) However, this style convention is not mandatory, and IDs should never be interpreted as carrying any meaning.</p>

Attribute Information

Used By

Element port

Source 

<xsd:attribute name="id" type="xsd:ID" use="required">
  <xsd:annotation>
    <xsd:documentation>
      <p>The xsd:ID type is an alphanumeric identifier, starting with a letter. Port IDs often contain the ID of their glyph, followed by a local port number (e.g. glyph4.1, glyph4.2, etc.) However, this style convention is not mandatory, and IDs should never be interpreted as carrying any meaning.</p>
    </xsd:documentation>
  </xsd:annotation>
</xsd:attribute>

Sample